Tachometer Pointer Fluctuates (May Be Wide Fluctuation); Tachometer Pointer Jumps Erratically - Isuzu Trooper 1999 Workshop Manual

Tachometer Pointer Fluctuates (May Be Wide Fluctuation)

Step
1 NOTE: Refer to the step 1 of diagnosis procedure for
Tachometer Does Not Function in this section.
Is the waveform normal?
2 Is the circuit between connector I–9 terminal 9 and the
PCM connector C–2 terminal C–10 normal?

Tachometer Pointer Jumps Erratically

Step
1 NOTE: Refer to the step 1 of diagnosis procedure for
Tachometer Does Not Function in this section.
Is the waveform normal?
2 Is the circuit between connector I–9 terminal 9 and the
PCM connector C–2 terminal C–10 normal?
Action
Action
WIRING SYSTEM
Value(s) Yes
Replace the
meter
— assembly
Replace the
—
PCM
Value(s) Yes
Replace the
meter
— assembly
Replace the
—
PCM
8D–247
No
Go to Step 2
Repair the
circuit
No
Go to Step 2
Repair the
circuit