TROUBLESHOOTING USING GSC FAULT CODES - Continued
CID 91 FMI 08
Throttle Position Signal.
FMI 08 - Abnormal Frequency, Pulse Width, or Period.
On EMCP, turn ENGINE CONTROL switch to OFF/RESET. Battery Disconnect
Switch is OFF; DEAD CRANK SWITCH is OFF.
Inspect connector ENG-P1 on ECM to EMCP harness (FO-2, Sheet 2). Inspect
connector ENG-P300 on ECM to ENG-P300 harness (FO-2, Sheet 1).
Conduct an appropriate pull test on wires to ensure wires are tight and secure.
Check the wires on the ECM to EMCP harness for abrasion and pinch points
Repair and/or replace the connectors and/or wiring (WP 0090), as necessary.
Set Battery Disconnect Switch to ON. Set DEAD CRANK SWITCH to NORMAL.
On EMCP turn the ENGINE CONTROL switch to COOL DOWN/STOP.
Measure 24 +/- 3 Vdc between terminal 15 (+) and terminal 16 (-) on LSMA4
(FO-4, sheet 2).
If 24 +/- 3 Vdc is not measured between terminal 15 (+) and terminal 16 (-) on the
LSMA4, perform Speed Control Test (WP 0013, SYMPTOM 9, STEP 3).
Verify the problem is resolved.
If 24 +/- 3 Vdc is measured between terminal 15 (+) and terminal 16 (-) on LSM
A4 (FO-4, Sheet 2), refer to WP 0013, SYMPTOM 9, STEP 3.
a. On EMCP, turn ENGINE CONTROL switch to MANUAL START.
b. Measure DC voltage between LSM A4 terminals 19 (+) and 20 (-).
Measurement should be 3.1 Vdc @ 60 Hz at not load. If not, adjust speed
If PWM output of LSM A4 is low and/or cannot be adjusted to 3.1 Vdc, check
speed trim potentiometer connections and test speed trim potentiometer
resistance. If speed trim potentiometer is ok, replace LSM A4 (WP 0041).
Verify the problem has been resolved.