Series 50G/60G Troubleshooting – Section 5.8 PID 91, FMI 3, Flash Code 21, Throttle Position Sensor Input Voltage High

Section 5.8
PID 91, FMI 3, Flash Code 21, Throttle Position Sensor Input Voltage High

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

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

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Section 5.8.1
Troubleshooting PID 91, FMI 3, Flash Code 21

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 417 (dark blue, Throttle Position Sensor) cavity D-2 in the Vehicle Interface Harness (VIH) 30–pin connector for a short to wire 916 (red/black) cavity A-3 in the VIH 30–pin connector (see Figure "Vehicle Interface Harness 30-pin Connector" ). Also check pin B (TPS) and pin C (Sensor Supply, +5VDC) in the TPS connector within the EFPA. If there is a short, repair or replace the wire(s), pins, and sockets.
   

   Figure 2. Vehicle Interface Harness 30-pin Connector

   1. If PID 91, FMI 3, Flash Code 21 is still active, go to step .
   2. If PID 91, FMI 3, Flash Code 21 is no longer active, refer to "5.8.2 Verification" .
2. Check wire 417 (dark blue, Throttle Position Sensor) cavity D-2 in the VIH 30–pin connector for a short to +12/24VDC (see Figure "Vehicle Interface Harness 30-pin Connector" ). Also check pin B (TPS) in the TPS connector within the EFPA. If there is a short, repair or replace the wire(s), pins, and sockets.
   1. If PID 91, FMI 3, Flash Code 21 is still active, call Detroit Diesel Technical Service.
   2. If PID 91, FMI 3, Flash Code 21 is no longer active, refer to "5.8.2 Verification" .

Section 5.8.2
Verification

Verify that troubleshooting was successful as follows: ‪

1. Check the DDR to see if PID 91, FMI 3, Flash Code 21 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.