Series 50G/60G Troubleshooting – Section 5.7 PID 51, FMI 7, Flash Code 65, Throttle Plate Not Responding

Section 5.7
PID 51, FMI 7, Flash Code 65, Throttle Plate Not Responding

The throttle plate is not responding due to an open wire, a short, throttle plate actuator alignment, or a faulty throttle plate actuator.‪

Section 5.7.1
Troubleshooting PID 51, FMI 7, Flash Code 65

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 907 (dark green, throttle plate position) cavity R-1 in the Engine Sensor Harness (ESH) 30–pin connector to see if the wire is open ( see Figure "Engine Sensor Harness 30–pin Connector" ).
   

   Figure 1. Engine Sensor Harness 30–pin Connector

   Check pin F (throttle plate position ) in the throttle actuator connector (see Figure "Throttle Actuator Connector" ). Repair or replace any open wires, pins, and sockets.‪

   

   Figure 2. Throttle Actuator Connector

   1. If PID 51, FMI 7, Flash Code 65 is still active, go to step .
   2. If PID 51, FMI 7, Flash Code 65 is no longer active, refer to "5.7.4 Verification" .
2. Check wire 907 (dark green, throttle plate position) cavity R-1 in the ESH 30–pin connector for a short to wire 956 (black, throttle actuator ground) in the throttle actuator connector (see Figure "Engine Sensor Harness 30–pin Connector" ). Also check pin F (throttle plate position) in the throttle actuator connector, and pin B (throttle actuator ground) in the throttle actuator connector. If there is a short, repair or replace the wire(s), pins, and sockets.
   1. If PID 51, FMI 7, Flash Code 65 is still active, go to step .
   2. If PID 51, FMI 7, Flash Code 65 is no longer active, refer to "5.7.4 Verification" .
3. Check wire 907 (dark green, throttle plate position) cavity R-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 F (throttle plate position) and pin C (sensor supply, +5VDC) in the throttle actuator connector. If there is a short, repair or replace the wire(s), pins, and sockets.
   1. If PID 51, FMI 7, Flash Code 65 is still active, go to step .
   2. If PID 51, FMI 7, Flash Code 65 is no longer active, refer to "5.7.4 Verification" .
4. Check wire 416 (gray, sensor supply, 5VDC) cavity W-1 in the ESH 30–pin connector to see if it is open (see Figure "Engine Sensor Harness 30–pin Connector" ). Also check pin C (sensor supply, +5VDC) in the throttle actuator connector. Repair or replace any open wires, pins, and sockets.
   1. If PID 51, FMI 7, Flash Code 65 is still active, go to step .
   2. If PID 51, FMI 7, Flash Code 65 is no longer active, refer to "5.7.4 Verification" .
5. Check wire 416 (gray, sensor supply, 5VDC) cavity W-1 in the ESH 30–pin connector for a short to wire 956 (black, throttle actuator ground) in the throttle actuator connector (see Figure "Engine Sensor Harness 30–pin Connector" ). Also check pin C (sensor supply, +5VDC) in the throttle actuator connector, and pin B (throttle actuator ground) in the throttle actuator connector. If there is a short, repair or replace the wire(s), pins, and sockets.
   1. If PID 51, FMI 7, Flash Code 65 is still active, go to step .
   2. If PID 51, FMI 7, Flash Code 65 is no longer active, refer to "5.7.4 Verification" .
6. Check wire 909 (light green, PWM No. 2 out) cavity Y-1 in the ESH 30–pin connector to see if it is open (see Figure "Engine Sensor Harness 30–pin Connector" ). Also check pin E (PWM No. 2 out) in the throttle actuator connector. Repair or replace any open wires, pins, and sockets.
   1. If PID 51, FMI 7, Flash Code 65 is still active, go to step .
   2. If PID 51, FMI 7, Flash Code 65 is no longer active, refer to "5.7.4 Verification" .
7. Check wire 909 (light green, PWM No. 2 out) cavity Y-1 in the ESH 30–pin connector for a short to wire 956 (black, throttle actuator ground) in the throttle actuator connector (see Figure "Engine Sensor Harness 30–pin Connector" ). Also check pin E (PWM No. 2 out) and pin B (throttle actuator ground) in the throttle actuator connector. If there is a short, repair or replace the wire(s), pins, and sockets.
   1. If PID 51, FMI 7, Flash Code 65 is still active, go to step .
   2. If PID 51, FMI 7, Flash Code 65 is no longer active, refer to "5.7.4 Verification" .
8. Check wire 445 (red, throttle body power) pin A in the throttle actuator connector (see Figure "Engine Sensor Harness 30–pin Connector" ). Also check pin D (throttle body power) in the OEM Power Harness (male/female connection).
   1. If PID 51, FMI 7, Flash Code 65 is still active, go to step .
   2. If PID 51, FMI 7, Flash Code 65 is no longer active, refer to "5.7.4 Verification" .
9. Check wire 445 (red, throttle body power) pin A in the throttle actuator connector for a short to wire 956 (black, throttle actuator ground) and pin B in the throttle actuator connector (see Figure "Engine Sensor Harness 30–pin Connector" ). Also check pin D (throttle body power) in the OEM Power Harness (male/female connection) and pin B (throttle actuator ground) in the OEM Ground Harness (male/female connection). If there is an open wire, repair or replace the wire(s), pins, and sockets.
   1. If PID 51, FMI 7, Flash Code 65 is still active, go to step .
   2. If PID 51, FMI 7, Flash Code 65 is no longer active, refer to "5.7.4 Verification" .
10. Check wire 956 (black, throttle actuator ground) pin B in the throttle actuator connector to see if it is open . (see Figure "Engine Sensor Harness 30–pin Connector" ). Also check pin B (throttle actuator ground) in the OEM Ground Harness (male/female connection).
    1. If PID 51, FMI 7, Flash Code 65 is still active, go to step .
    2. If PID 51, FMI 7, Flash Code 65 is no longer active, refer to "5.7.4 Verification" .
11. Check the throttle plate actuator alignment using the bolt tightening sequence (refer to "5.7.2 Bolt Tightening Sequence" ).

Section 5.7.2
Bolt Tightening Sequence

Loosen the bolts using the following sequence:‪

1. Loosen the four bolts that attach the intake elbow to the rear of the throttle.
2. Loosen the four bolts that attach the Mixer/PSV assembly to the front of the throttle
3. Loosen the two bolts that attach the low pressure regulator to the intake elbow.
4. Loosen the four bolts that attach the throttle to the throttle bracket.

Tighten all the bolts using the following sequence:‪

Note: Torque for all bolts is 34 N·m (25 ft·lb).

1. Tighten the two bolts from the throttle bracket to the gear case.
2. Tighten the one bolt from the throttle bracket to the cylinder head.
3. Tighten the four bolts from the Mixer/PSV assembly to the throttle.
4. Tighten the four bolts from the throttle to the inlet elbow.
5. Tighten the two bolts from the IMPCO regulator.
6. Tighten the two bolts from the throttle bracket to the inlet elbow.
7. Tighten the four bolts from the bottom of the throttle bracket to the throttle.
   1. If PID 51, FMI 7, Flash Code 65 is still active, replace the throttle plate actuator (refer to "5.7.3 Replacement of the Throttle Actualor" ).
   2. If PID 51, FMI 7, Flash Code 65 is no longer active, refer to "5.7.4 Verification" .

Section 5.7.3
Replacement of the Throttle Actualor

The throttle actuator (see Figure "Throttle Actuator for the Series 60G Engine" ) is non-serviceable and should be replaced as a unit.

Figure 3. Throttle Actuator for the Series 60G Engine

‪

Section 5.7.3.1
Removal of Throttle Actuator

Remove the throttle actuator as follows:‪

1. Vent the fuel system.
2. Disconnect and remove the six-wire power harness connectors from the throttle actuator.
3. Remove the four bolts connecting the throttle actuator to the mounting bracket.
4. Remove the eight bolts attaching the throttle to the inlet and outlet tube assemblies.

Section 5.7.3.2
Installation of Throttle Actuator

Install the throttle actuator as follows:‪

1. Secure the throttle actuator to the mounting bracket with the four bolts and torque to 20 N·m (15 lb·ft).
2. Connect the six-wire power harness.
3. Install a new gasket and attach the outlet tube assembly using four bolts.
4. Install a new gasket and attach the inlet tube assembly using four bolts.
5. Run engine and check for air or air and fuel mixture leaks at the throttle and connecting hoses.
   1. If the code is still active, call Detroit Diesel Technical Service.
   2. If the code is no longer active, refer to "5.7.4 Verification"

Section 5.7.4
Verification

Verify that troubleshooting was successful as follows: ‪

1. Check the DDR to see if PID 51, FMI 7, Flash Code 65 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. Call Detroit Diesel Technical Service.