DDEC III/IV Single ECM Troubleshooting – Section 17.3 Troubleshooting Flash Code 17, Throttle Plate Input Voltage

Section 17.3
Troubleshooting Flash Code 17, Throttle Plate Input Voltage

The following procedure will troubleshoot Flash Code 17, throttle plate input voltage high:‪

Section 17.3.1
Check Actuator

Perform the following steps to check the actuator.‪

1. Unplug throttle actuator connector.
2. Turn ignition ON.
3. Plug in DDR.
   1. If code p 051/3 is logged, refer to "17.3.3 Check Sensor" .
   2. If code p 051/4 is logged, refer to "17.3.5 Check for Open" .

Section 17.3.2
Check Connectors

Perform the following steps to check the connectors.‪

1. Turn ignition OFF.
2. Check connectors, ECM side and throttle actuator side, for damaged, bent or broken pins.
   1. If the connectors are not damaged, replace the actuator. Refer to "17.3.6 Verify Repairs" .
   2. If the connectors are damaged, bent or have broken pins, repair or replace the connectors or pins; refer to "17.3.6 Verify Repairs" .

Section 17.3.3
Check Sensor

Perform the following steps to check the sensor.‪

1. Turn ignition OFF.
2. Unplug the engine sensor harness.
3. Measure resistance between W1 and R1. See Figure "Gas Engine Sensor Harness" .
   1. If the resistance measurement is less than or equal to 1,000 Ω, the wires are shorted to each other. Repair the short or replace the engine sensor harness. Refer to "17.3.6 Verify Repairs" .
   2. If the resistance measurement is greater than 1,000 Ω, refer to "17.3.4 Check for Voltage" .
   

   Figure 1. Gas Engine Sensor Harness

Section 17.3.4
Check for Voltage

Perform the following steps to check for voltage.‪

1. Reconnect the engine sensor harness.
2. Measure voltage between cavity R1 and battery (-), ground. See Figure "Gas Engine Sensor Harness" .
   1. If the voltage measurement is greater than 4.5 volts, the wire is shorted to the voltage supply. Replace the #907 wire, or replace the harness. Refer to "17.3.6 Verify Repairs" .
   2. If the voltage is less than 4.5 volts, refer to "17.3.5 Check for Open" .

Section 17.3.5
Check for Open

Perform the following steps to check for open.‪

1. Turn ignition OFF. Disconnect engine sensor harness.
2. Place a jumper wire between cavity F and D of the throttle actuator connector.
3. Measure resistance between R1 (#907) and Y2 (#452). See Figure "Gas Engine Sensor Harness" .
   1. If the measured resistance is greater than 1,000 Ω, the return line (#452) is open. Repair the open and refer to "17.3.6 Verify Repairs" .
   2. If the measured resistance is less than 1,000 Ω, refer to "17.3.2 Check Connectors" .

Section 17.3.6
Verify Repairs

Perform the following steps to verify repairs.‪

1. Plug in all connectors.
2. Clear the codes.
3. Start and run the engine.
4. Operate at idle and rated speed.
5. Turn ignition OFF.
6. Plug in DDR and read the codes.
   1. If no codes are logged, troubleshooting is complete.
   2. If any codes are logged, review this section to find the error. Then, contact Detroit Diesel Technical Services.