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Isuzu Trooper Maintenance and Repair
Got problems? Got solutions? This is the place to talk about them!
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I had the same problem as you are having now, I removed the switch assy from the transmission (held on by 3 small bolts) and one electrical connection. I dismantled the switch and found that all the grease inside had dried up and the switch contacts were shorting on each other. I cleaned out the switch and relubricated it with dielectric grease . Make sure to install the switch exactly as you found it as the position of the switch is adjustable and Very important as it tells the computer what gear you have selected. Hope this helps.
You can check the fuel pressure (carefully) to see if you are getting the correct pressure at TB. There is a pressure regulating valve that could also be at fault
MEASURE FUEL PRESSURE
Start engine and idle.
Disconnect fuel pressure regulator vacuum hose and plug. Fuel pressure should be 294 kPa (42 psi)
Reconnect hose at regulator. Fuel pressure should be 245 kPa (35 psi)
Disconnect vacuum hose from regulator and plug it.
Turn engine off and observe pressure reading. Fuel pressure should remain approximately 245 kPa (35 psi) for four (4) minutes.
Looks like you should have 35 pounds of pressure at rest. Remember that without the engine running, the fuel pump may only be on for as little as 2 seconds when the key is turned on. There are previous posts that show how to energise the pump directly for test purposes if you do not already know how to do this.
1991 Isuzu Truck Trooper II L4-2559cc 2.6L SOHC (4ZE1)
Vehicle Level Powertrain Management Fuel Delivery and Air Induction Description and Operation Fuel Injection System
Fuel Injection System
The multi-point electronic fuel injection system consists of the ECM, various engine condition and operation sensors and the fuel system. The main control sensor is the oxygen sensor. Utilizing these inputs, the ECM calculates fuel injection quantity and timing. Because injector valve opening is a constant and fuel pressure is regulated in relation to intake manifold pressure, the ECM controls injection quantity by varying the duration of injector "ON" time.
Fuel Injector
The injectors are "ON/OFF" solenoid valves installed one per cylinder on the intake manifold. The ECM sends pulses to energize (open) the injectors for varying lengths of time depending on its fuel requirement calculations, thereby controlling air/fuel ratio under a wide range of operating conditions.
.Let us know what you find. Hope this helps.
The "Check Engine" light displays trouble codes that are stored in ECM memory. To activate the Diagnostic mode, a special connector located in the center console is utilized. When the ALDL (assembly line diagnostic link) connector is jumpered between terminals "A" and "B" with the ignition "ON" and the engine not running, the light will flash any stored codes.
The first code to display should be code 12. This indicates that the self-diagnostics are functioning and is not a trouble code. The code 12 display is a flash followed by a short pause, then two flashes followed by a longer pause. If other codes are present, they will display in the same manner after code 12 has flashed three times. For example, the code 23 display is two flashes followed by a short pause, then three flashes followed by a longer pause. Each stored code is displayed three times, starting with the lowest in numerical order. Code 12 will repeat when all codes have shown. If no codes are stored, code 12 will display repeatedly until Diagnostic mode is exited by removal of the ALDL jumper wire. Remove the jumper wire before attempting to start the engine.
To allow checking circuits which may be difficult to energize without driving the vehicle and being under particular operating conditions, all ECM controlled relays and solenoids (except fuel pump relay) are energized in Diagnostic mode.
"Scan" tools also utilize the ALDL connector to access system diagnostic information. The use of a "Scan" tool is required to perform many of the tests under TROUBLE CODE COMPONENTS. here is link to ALDL pin locations. http://www.carspace.com/atfdmike/.59aa317f!v=
I hope this helps.
http://www.carspace.com/atfdmike/.59aa3141!v=
http://www.carspace.com/atfdmike/.59aa313d!v=
http://www.carspace.com/atfdmike/.59aa3151!v=
http://www.carspace.com/atfdmike/.59aa3152!v=
Hope this helps
Here is link to picture
http://www.carspace.com/atfdmike/.59aa8805!v=
The anti theft alarm controller is solid state, but I would suggest checking each door switch, cleaning terminal and checking hood switch , are door lock actuators working right,too before messing with controller. They must all function properly for the system to work right. Also, you don't mention the alarm security light on your dash.....did it work when you got it, did it quit, etc; The more info y ou provide, the more people here will be able to help. Good luck
1995 Isuzu Truck Trooper (4 Door) V6-3165cc 3.2L DOHC (6VD1)
Vehicle Level Accessories and Optional Equipment Antitheft and Alarm Systems Description and Operation Anti-Theft System
Anti-Theft System
The Anti-theft System consists of the following components:
Anti-theft controller
Left and right door switches
Left, right, and tailgate door key detect and tamper switches
Tailgate switch
Engine hood switch
Door lock actuators
Left and right front door lock switches
Lighting relay
Starter relay
Headlights
"ANTITHEFT" indicator light
Anti-theft horn
The arming sequence is initiated with the starter switch in the LOCK position and all doors closed. This results in all theft related switches to be open to ground. The "ANTITHEFT" indicator then flashes for about 30 seconds or until the arming sequence is completed. When the driver's door is locked using the door key, the door lock actuator internal switch will open, removing the ground signal from the anti-theft control unit input. Now all inputs to the anti-theft control unit are open to ground and the "ANTI-THEFT" indicator stays lit for about 8 seconds . The anti-theft system is now armed. If any of the theft related switches are grounded, the theft alarm is activated. The anti-theft controller does not allow the vehicle to be started by not applying ground to the starter relay. The anti-theft controller pulses a ground signal to the lighting relay causing the headlights to flash. At the same time, the anti-theft controller unit pulses a ground signal to the anti-theft horn, causing it to sound. The system alarm is cancelled when the anti-theft controller sees battery voltage at its ignition input or a ground signal at its key detect input.
GENERAL DESCRIPTION
The circuit consists of the starter switch, anti-theft controller, anti-theft horn, front door and tailgate key switch (detect and tamper switch)~ door lock (& power window) switch, door lock actuator for each door, engine hood switch, clutch start switch (M/T), ANTI-THEFT indicator light and mode switch (A/T). The system operates as follows: After locking the starter switch and removing the starter key (this sets the alarm), if the door is unlocked in any way other than with the proper key, the headlights start flashing, the horn sounds, and the starter circuit is disabled. (However, the engine hood and all the doors must be locked and closed.)
Once the system has been placed in the warning or alarm condition, it can be released only when the starter switch is shifted from "OFF" to "ACC" by the starter key, or when the lock of the front door or the tailgate is released (to activate the detect switch) by the starter key.
http://www.carspace.com/atfdmike/.59a19a22/
Thanks, Rick
..
Or the 6 cylinder gasoline engine? I have not heard of a 4 cylinder gasoline 2001 Trooper.
1995 Isuzu Truck Trooper (2 Door) V6-3165cc 3.2L DOHC (6VD1)
Vehicle Level Transmission and Drivetrain Transmission Control Systems Testing and Inspection Testing and Inspection Procedures Displaying and Reading Trouble Codes
Displaying and Reading Trouble Codes
This is a link to a diagram of locating the jumpers.
http://www.carspace.com/atfdmike/Albums/ISUZU%20TROOPER%20FORUM/95truprtrancode1- .gif/photo/v./photo.jpg
DTC can be displayed by the Transmission Control Module (TCM) by shorting together terminals 1 and 2 of the TCM Diagnosis Connector (C-92) located left side of left instrument panel (This grounds the TCM pin D16).
After this, the CHECK TRANS Indicator will be OFF for 3.2 second and then will flash each DTC 3 times.
When there are more than 9 flashes this means that the indicator is constantly flashing, OFF for 0.4 seconds, ON for 0.4 seconds. In this case there is no DTC stored in memory. To find the problem without a scan tool and without DTC GOTO WITHOUT DTC CHECK.
When there are less than 9 flashes you will see DTC of 2 digits repeated 3 times each and when all codes have been displayed they are displayed again beginning from the first one.
Do not care about the DTC order : if "21" is before "22" it does not matter.
Write down all codes numbers and GOTO DTC CHECK.
IF CHECK TRANS indicator is not flashing GOTO "CHECK TRANS" CHECK.
I have a '93 Trooper who is my pride and joy. I have had her for 2 years, third owner. When I bought her I did some preventive maint. stuff (brakes, tires, timing belt, clutch,etc)--and she runs great. She's got 111k and my issue now is a fuel smell/leak in the engine compartment. Needless to say, she is parked. Other than the smell and obvious leak, she runs great (best in cold weather)no stalling nothing. We can't find the source of the leak. My questions: Is it about time for an overhaul? Should I consider an overhaul? Would an overhaul replace parts that might be causing the fuel leak? (I'm assuming it is something along the line of worn hoses and the like) Should I instead just concentrate on letting a mechanic find just the leak? I intend to keep this Trooper until the wheels fall off so an overhaul is just a matter of time. Please forgive my total inexperience with vehicles, this is my second car--and I'm quite attached to her.
Thanks
jimbill
I have to wonder though, that if your original trans was OK except for reverse, then the new trans does not sound like it was built properly if you have had problems with it since installation.
You might inquire if the mechanic used a scan tool to check for trouble codes that might be set in the transmission controller. Good luck
Good luck
You can check for codes too, if you find any, post and an answer may be had, by:
Connect white (test lead) and black (ground lead) wires that are branched from the fuel system control harness approximately 8 inches from ECM. (These leads can usually be found near the cigarette lighter and will be wrapped in green tape if they have never been disturbed). After the leads are connected, turn the ignition switch "On". The ``Check Engine'' lamp will flash appropriate trouble codes. The codes are indicated by pulsing of the lamp. Two pulses followed by a short time lapse, then three pulses would indicate a code 23 and so on. If only one trouble code is stored, the code will repeat continuously until test leads are disconnected. If more than one trouble code is stored, each code will repeat three times, starting with the lowest, then proceed to the next code. After all codes have been shown, the pattern will repeat itself. Refer to Fig. 4 for trouble code identification.
Trouble codes can be cleared by removing voltage to the ECM for 10 seconds. After a fault has been corrected, remove the ECM fuse or disconnect battery cables for 10 seconds.
Remember, these are just suggestions, you have to start somewhere, but sometimes they help.
1985 Isuzu Truck Trooper II L4-1949cc (G200z)
Vehicle Level Technical Service Bulletins All Technical Service Bulletins Alternator Wire - Damage/Shorting
Alternator Wire - Damage/Shorting
BULLETIN NUMBER ISSUE DATE GROUP
SB87-04-003 July 17, 1987 ELECTRICAL
P'UP (KB) AND TROOPER II (KT) ALTERNATOR WIRE DAMAGE (4ZD1 ENGINE)VEHICLES AFFECTED
P'UP (KB) and Trooper II (KT) models with 4ZD1 engine.
SERVICE INFORMATION
Several wires at the rear of the alternator are routed through a metal hold-down clamp. This clamp may damage the wires' insulation, eventually shorting or grounding the wires. Various electrical problems
ranging from a blown fuse to failure to start may result from this damage.
SERVICE PROCEDURE
If the wires at the rear of the alternator are damaged, repair or replace the harness as required. Even if no damage is visible, wrap the affected area with tape or other protective material to prevent future damage.
1985 Isuzu Truck Trooper II L4-1949cc (G200z)
Vehicle Level Technical Service Bulletins All Technical Service Bulletins Engine - Backfires Excessively
Engine - Backfires Excessively
BULLETIN NUMBER ISSUE DATE GROUP
SB87-03-004 September 15, 1987 EMISSIONS
P'UP (KB) AND TROOPER II (KT) EXCESSIVE BACKFIRING (GASOLINE ENGINES)
VEHICLES AFFECTED
1982-1987 P'UP (KB) and Trooper II (KT) models with gasoline engines.
SERVICE INFORMATION
http://www.carspace.com/atfdmike/Albums/ISUZU%20TROOPER%20FORUM/85trupr11gas.gif- - /photo/v./photo.jpg
Excessive backfiring may be caused by a clogged gas vapor filter. Filter is located between the intake manifold and the mixture control valve.
SERVICE PROCEDURE
Replace the gas vapor filter as outlined in the appropriate Workshop Manual.
PARTS INFORMATION
Part No. Description
8-94236-909-0 Gas Filter
Help, I can't afford another costly repair!
jimbill
I would definitely look at the fuses for your problem. Checking each with an ohm meter should help eliminate or reveal where the problem might lie.
Isuzu constantly recommends that the connectors and electrical cable be inspected for breaks and corrosion problems. It would not hurt to inspect the connectors as well to see that no corrosion or disconnects are present. Good luck, hope this helps.
1985 Isuzu Truck Trooper II L4-1949cc (G200z)
Vehicle Level Technical Service Bulletins All Technical Service Bulletins Electrical - Inspect Connectors for Various Malfunctions
Electrical - Inspect Connectors for Various Malfunctions
Information IB05-04-S005
Inspection Of All Related Wiring Harness Connections
When Diagnosing Miscellaneous DTC's, Intermittent
Driveability Concerns, Hard Start, No Start, Incorrect
Gauges, Inoperative Air Conditioning Systems, Service
Engine Soon Lamps Illuminated, 4WD Lamp Illuminated,
Instrument Panel Gauges Inoperative, Cruise Inoperative
ISSUE DATE: SEPTEMBER 22, 2005
Affected Vehicles
All Isuzu Vehicles
Service Information
When servicing a vehicle for any type of customer concern, the following steps are imperative. Inspect and ensure the integrity of all related wiring harness connectors. If the wiring harness connectors are not properly put together or engaged before they are locked together, numerous types of intermittent conditions may occur, which may include any of the symptoms listed above and possibly others.
The first step in any type of electrical diagnosis is a visual and physical inspection of the wiring harness connectors for integrity. Many times, the vehicle may be repaired just by disconnecting and reconnecting the connectors. As with all repairs to wiring harness connectors and terminals, a pull test of the terminals within the connector should be performed. A pull test is performed by inserting the proper size terminal test tool (not a paper clip) into the terminal to determine whether or not the terminal is making good contact, or whether the terminal has been damaged from the prior improper connection or lack of connection.
NOTE : Most terminals used in current module connectors (ECM, BCM, and the like) are small O~64 mm sq terminals and can be damaged by probing with the wrong tool
For example, if the Connector C2 of the engine wiring harness to the Powertrain Control Module (PCM) is not properly seated into the PCM:
^ The cam lock lever may close improperly.
^ The cam lock lever may even snap out of position.
^ The vehicle may have an intermittent condition with any one of the components which are controlled or monitored by the PCM.
THE CAM LOCK LEVER IS DESIGNED TO PULL (OR ASSIST) THE CONNECTOR INTO ITS FINAL POSITION ONCE IT HAS BEEN PRESSED STRAIGHT INTO THE PCM HEADER PAST THE INITIAL DETENT, ALLOWING THE LEVER TO BE MOVED INTO THE LOCKED POSITION. It is not only a retainer but an assist during the connection process. When the wiring harness connector is properly connected to the PCM, a snap will be heard when the connector is in position to be fully seated. The cam lock lever may then be closed. The cam lock lever will then do its designated job as both an assist and ensuring the connector does not come apart due to vibration or other types of conditions found in vehicles as they travel down the highway.
Remember, if a terminal (metal) or the connector (plastic) is damaged, they should be replaced. DO NOT replace the complete wfring harness assembly. Some harnesses are now on order restriction since most harness damage can be repaired.
Replacement Terminals can be found in the J 38125 Terminal Repair Kit, which is available through Kent Moore at 1-800-654-6333.
1985 Isuzu Truck Trooper II L4-1949cc (G200z)
Vehicle Level Technical Service Bulletins All Technical Service Bulletins Alternator Wire - Damage/Shorting
Alternator Wire - Damage/Shorting
BULLETIN NUMBER ISSUE DATE GROUP
SB87-04-003 July 17, 1987 ELECTRICAL
P'UP (KB) AND TROOPER II (KT) ALTERNATOR WIRE DAMAGE (4ZD1 ENGINE)VEHICLES AFFECTED
P'UP (KB) and Trooper II (KT) models with 4ZD1 engine.
SERVICE INFORMATION
Several wires at the rear of the alternator are routed through a metal hold-down clamp. This clamp may damage the wires' insulation, eventually shorting or grounding the wires. Various electrical problems
ranging from a blown fuse to failure to start may result from this damage.
SERVICE PROCEDURE
If the wires at the rear of the alternator are damaged, repair or replace the harness as required. Even if no damage is visible, wrap the affected area with tape or other protective material to prevent future damage.
NOTE: The vehicle speed sensor is not at the wheel itself, which is what code 24 refers to. It is NOT the wheel speed sensor which is found at each wheel. Codes for them are in the anti lock brake system module. Brake codes only seem to go from 1 to 15.
1992 Isuzu Truck Trooper (4 Door) V6-3165cc 3.2L SOHC (6VD1)
Vehicle Level Powertrain Management Computers and Control Systems Vehicle Speed Sensor Description and Operation Circuit Operation
Circuit Operation
The vehicle speed sensor generates a signal which indicates the vehicle speed to the speedometer. The speedometer consists of a vehicle speed sensor, an ammeter (needle movement), stepper motor (odometer) and a driving circuit (printed circuit board).
The vehicle speed sensor is mounted to the transmission. The transmission pinion shaft rotates and generates four pulses per one rotation. The rate at which the pulses are generated indicates the vehicle speed. The vehicle speed sensor (incorporated in the speedometer) uses the pulses to control needle movement and sends vehicle speed information to the electronic control module (ECM) and the cruise control unit, The speedometer sends 4096 pulses per mile and the frequency indicates the vehicle speed.
1992 Isuzu Truck Trooper (4 Door) V6-3165cc 3.2L SOHC (6VD1)
Vehicle Level Powertrain Management Computers and Control Systems Vehicle Speed Sensor Testing and
VEHICLE SPEED SENSOR (INCORPORATED IN THE SPEEDOMETER)
INSPECTION
Remove the speedometer from the meter assembly, and measure the resistance value between the terminals. (Fig. 8-365)
Replace the speedometer assembly when the result of inspection is found abnormal.
http://www.carspace.com/atfdmike/Albums/ISUZU TROOPER FORUM/dtc24vss.gif/pag- e/photo.html#pic
1992 Isuzu Truck Trooper (4 Door) V6-3165cc 3.2L SOHC (6VD1)
Vehicle Level Powertrain Management Computers and Control Systems Testing and Inspection Diagnostic Strategies Intermittant Check Procedure
Intermittant Check Procedure
"Intermittent" means that the "Check Engine" light comes on at times but does not stay on. Since codes may or may not be stored, the use of diagnostic charts could result in replacement of good parts.
Most intermittent problems are caused by faulty electrical wiring or connections. Carefully check these potential causes:
Poor mating of connector halves or terminals not fully seated in connector body.
Deformed or damaged terminals. All connector terminals in problem circuit should be carefully reformed to increase contact tension.
Poor terminal-to-wire connection. This requires removing terminal from connector body to properly check.
Poor ground connections.
If a visual check does not find the source of the problem, the vehicle may be driven with a voltmeter connected to a suspect circuit. An abnormal voltage reading when the problem occurs indicates the problem may be in that circuit.
An intermittent "Check Engine" light with no stored code may be caused by:
Arcing at ignition coil, plug wires or spark plugs.
Faulty power supply main relay.
Poor power supply circuit connections.
"Check Engine" light wire to Engine Control Module (ECM ) shorted to ground (circuit 22).
Diagnostic test lead to ECM shorted to ground (circuit 24).
Poor ECM ground connections at intake manifold.
Electrical system interference caused by a defective relay, ECM driven solenoid or switch. These problems cause an electrical surge and normally occur when the faulty component is operated.
Improper installation of accessories such as lights, sound systems, alarms, etc.
1992 Isuzu Truck Trooper (4 Door) V6-3165cc 3.2L SOHC (6VD1)
Vehicle Level Powertrain Management Computers and Control Systems Testing and Inspection Trouble Code Diagnostic Charts Code 24
Code 24
http://www.carspace.com/atfdmike/Albums/ISUZU TROOPER FORUM/dtc24a.gif/page/- photo.html#pic
Circuit Description
Vehicle speed information is provided to the Engine Control Module (ECM) by the Vehicle Speed Sensor (VSS), which alternately grounds WHT wire located in the meter panel when the drive wheels are turning. This pulsing action takes place 4096 times per mile, and the ECM will calculate vehicle speed based on the time between "pulses".
Test Description
Numbers below refer to circled numbers on the diagnostic c~art.
Diagnostic Trouble Code (DTC) 24 will set if vehicle speed equals 0 mile per hour when:
Engine speed is between 1600 and 1825 revolution per minute.
Vehicle speed is indicated less than 1 Km/H (0.6 mile per hour).
Manifold absolute pressure reading below 20.7 kPa.
Low speed condition (low manifold absolute pressure voltage, high manifold vacuum)
Not in park or neutral. (A/T)
All conditions are met simultaneously for 1.5 seconds.
No DTC 33 is set. These conditions are met during a road load deceleration. Disregard DTC 24 that sets when drive wheels are not turning.
Diagnostic Aids
"Scan tool" should indicate a vehicle speed whenever the drive wheels are turning greater than 0.6 mile per hour. Check the WHT wire for proper connections to be sure they are clean and tight and the harness is routed correctly.
(A/T)- A faulty or misadjusted park/neutral position switch can result in a false DTC 24. Use a "Scan tool" and check for proper signal while in "DRIVE". Refer to CHART C-1A for park/neutral position switch check.
If DTC 24 is intermittent,
See: Diagnostic Strategies\Intermittant Check Procedure