ELECTRICAL SYSTEM TESTS, INSPECTIONS, AND ADJUSTMENTS - CONTINUED
THROTTLE POSITION SENSOR CIRCUIT TEST - CONTINUED
Check supply voltage at ECM.
Disconnect J1/P1 ECM connector.
Remove wires from terminals P1-4 (8 VDC supply) and P1-5 (digital return). Install jumper wires into terminal
locations for digital return wire and supply wire.
Reconnect J1/P1 ECM connector.
Turn engine start switch to ON position (TM 5-3805-291-10).
Measure voltage between wire jumpers in terminals P1-4 (8 VDC supply) and P1-5 (digital return).
Turn engine start switch to OFF position (TM 5-3805-291-10).
Expected Results. Supply voltage measures 8.0 ± 0.4 VDC at ECM.
If results are OK, there is an open circuit or excessive resistance in harness between ECM and sensor.
Replace wiring harness in question (WP 0195 00 thru WP 0201 00). Ensure seals are properly in place and
connectors are securely connected. Verify repair eliminates problem.
If results are not OK, ECM does not appear to be producing correct supply voltage. Replace ECM (WP
0057 00). Verify repair eliminates problem.
USER DEFINED SHUTDOWN INPUT CIRCUIT TEST
System Operation Description:
Use this procedure to troubleshoot problem with circuit for user defined shutdown switch. Use this procedure if
267-02 Incorrect Engine Shutdown Switch inputs diagnostic code is active or if E265 User Defined Shutdown
event code is active.
User defined shutdown switch provides ability to shut down engine. Engine's ECM remains active. ET can be used
to communicate with ECM. User defined shutdown switch must be returned to RUN position and engine start
switch must be cycled to OFF position before ECM will allow engine to start.
To shut down engine, lift red cover guard and toggle user defined shutdown switch to SHUTDOWN position.
ECM reads position of user defined shutdown switch. If engine is running, ECM disables fuel injection. ECM will
not allow engine to start if engine is not running.
Voltage at ECM input P1-40 of user defined shutdown switch should be 11.5 ± 0.5 VDC with user defined shut-
down switch in RUN position. Voltage at ECM input P1-23 of user defined shutdown switch should be less than
0.5 VDC with user defined shutdown switch in RUN position.