Series 50G/60G Troubleshooting – Section 5.9 PID 91, FMI 4, Flash Code 22, Throttle Position Sensor Input Voltage Low

Section 5.9
PID 91, FMI 4, Flash Code 22, Throttle Position Sensor Input Voltage Low

The Throttle Position Sensor (TPS) in the Electronic Foot Pedal Assembly (EFPA), see Figure "Typical EFPA Device (Shown with 6–pin Connector)" , has low input voltage due to an open wire or a short.

Figure 1. Typical EFPA Device (Shown with 6–pin Connector)

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Section 5.9.1
Troubleshooting PID 91, FMI 4, Flash Code 22

Troubleshoot as follows:‪

NOTICE:
To avoid damage to the harness and connectors when disconnecting harness connectors, ensure the pulling force is applied to the connectors and not to the wires extending from the connectors.‪

1. Check wire 910 (orange PWM No. 3 out) cavity W-2 in the Engine Sensor Harness (ESH) 30–pin connector for a short to wire 416 (gray, sensor supply, 5VDC) cavity W-1 in the ESH 30–pin connector (see Figure "Engine Sensor Harness 30–pin Connector" ).
   

   Figure 2. Engine Sensor Harness 30–pin Connector

   Also check pin H (PWM No. 3 out) in the PSV connector (see Figure "PSV Connector" ). If there is a short, repair or replace the wire(s), pins, and sockets.‪

   

   Figure 3. PSV Connector

   1. If PID 91, FMI 4, Flash Code 22 is still active, go to step .
   2. If PID 91, FMI 4, Flash Code 22 is not active, refer to "5.9.2 Verification" .
2. Check wire 909 (light green, PWM No. 2 out) cavity Y-1 in the ESH 30–pin connector for a short to wire 416 (gray, sensor supply, 5VDC) cavity W-1 in the ESH 30–pin connector (see Figure "Engine Sensor Harness 30–pin Connector" ). Also check pin E (PWM No. 2 out in the PSV connector (see Figure "PSV Connector" ) and pin C (sensor supply, +5VDC) in the throttle actuator connector (see Figure "PSV Connector" ). If there is a short, repair or replace the wire(s), pins, and sockets.
   1. If PID 91, FMI 4, Flash Code 22 is still active, go to step .
   2. If PID 91, FMI 4, Flash Code 22 is not active, refer to "5.9.2 Verification" .
3. Check to see if wire 417 (dark blue, Throttle Position Sensor) cavity D-2 in the VIH 30–pin connector is open (see Figure "Vehicle Interface Harness 30–pin Connector" ). Also check pin B in the TBS connector in the EFPA. Repair or replace any open wires, pins, and sockets.
   

   Figure 4. Vehicle Interface Harness 30–pin Connector

   1. If PID 91, FMI 4, Flash Code 22 is still active, go to step .
   2. If PID 91, FMI 4, Flash Code 22 is not active, refer to "5.9.2 Verification" .
4. Check to see if wire 417 (dark blue, Throttle Position Sensor) cavity D-2 in the VIH 30–pin connector is short to ground (see Figure "Vehicle Interface Harness 30–pin Connector" ). Also check pin B in the TBS connector in the EFPA. If there is a short, repair or replace the wire(s), pins, and sockets.
   1. If PID 91, FMI 4, Flash Code 22 is still active, call Detroit Diesel Technical Service.
   2. If PID 91, FMI 4, Flash Code 22 is not active, refer to "5.9.2 Verification" .

Section 5.9.2
Verification

Verify that troubleshooting was successful as follows: ‪

1. Check the DDR to see if PID 91, FMI 4, Flash Code 22 is still active.
   1. If the code is still active, go to step 2.
   2. If the code is not active, troubleshooting is complete.
2. If the code is still active, call Detroit Diesel Technical Service.