Isuzu Cars and Trucks 1981-1991

Ignition System Diagnosis

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SERVICE PRECAUTIONS

Be careful not to get water on any fuel injection system component. Pay close attention to the relay box and throttle valve switch connector. The connector is not water proofed and will be damaged by water.

When charging the battery be sure to remove it from the vehicle first. Never disconnect the battery cable from the battery when the engine is running. The generation of surge voltage may damage the control unit harness connector, disconnect all the control unit harnesses first, then set the starter switch to the ON position.

When replacing parts or checking the system, make sure to set the starter switch to the OFF position. When measuring voltage at the control unit harness connector, disconnect all the control unit harnesses first, then set the starter switch to the ON position.

The wiring connectors for the fuel injector, throttle valve switch, air regulator and water temperature sensor are provided with locked wires. To unlock the connector, pull and shake it gently.

System cables must be placed at least four inches away from the tension cables. Be careful not to apply and shock to the system components such as the air flow sensor, crank angle sensor and control unit. Component parts of the fuel injection system are precisely set. Even a slight distortion or dent will seriously affect performance.

The fuel pump must not be operated without fuel. Since fuel lubricates the pump, noise or other serious problems such as parts seizure will result. It is also prohibited to use any fuel other than gasoline.


NOTE
For wiring diagrams not found in this section, refer to .

G180Z, G200Z, 4ZC1-T and 1985 4XC1-U Diagnostic Charts 1 and 194


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Fig. Ignition system wiring RWD I-Mark



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Fig. Diagnostic chart 1



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Fig. Diagnostic chart 2



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Fig. Diagnostic chart 3



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Fig. Diagnostic chart 4

1986 and 1989 4XC1-U and 4XC1-T I-Mark Diagnostic Charts 5 and 6


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Fig. Wiring diagram 1986 and 1989 I-Mark (non-turbo) 4XC1-U



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Fig. Wiring diagram 1986 and 1989 I-Mark (turbo) 4XC1-T



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Fig. Diagnostic chart 5



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Fig. Diagnostic chart 6

4XE1 SOHC and DOHC Impulse and Stylus Diagnostic Charts 11-15


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Fig. Ignition wiring diagram Impulse and Stylus SOHC and DOHC 4XE1



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Fig. Diagnostic chart 11



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Fig. Diagnostic chart 12 (A-1)



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Fig. Diagnostic chart 13 (A-2)



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Fig. Diagnostic chart 14 (A-3)



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Fig. Diagnostic chart 15 (A-3)

4XE1 DOHC Turbo Impulse Diagnostic Charts 16 and 1923


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Fig. Ignition wiring diagram Impulse Turbo DOHC 4XE1



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Fig. Diagnostic chart 16



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Fig. ECM and ALDL wiring DOHC 4XE1 Turbo



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Fig. Diagnostic chart 17 (A-1)



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Fig. Diagnostic chart 18 (A-2)



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Fig. Diagnostic chart 19 (A-3)



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Fig. Diagnostic chart 20 (A-3)



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Fig. Diagnostic chart 21



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Fig. Diagnostic chart 22



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Fig. Diagnostic chart 23

4ZD1 and 4ZE1 Engines, P'up, Amigo, Rodeo, Trooper Diagnostic Charts 7 and 1910


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Fig. Ignition system diagram 4ZD1 and 4ZE1 engines



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Fig. Diagnostic chart 7



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Fig. Diagnostic chart 8



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Fig. Diagnostic chart 9



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Fig. Diagnostic chart 10

V6 Engines, Trooper II and Rodeo Diagnostic Chart 24


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Fig. Ignition system wiring diagram V6 Trooper



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Fig. Ignition system wiring diagram V6 Rodeo



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Fig. Diagnostic chart 24

 
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