DDEC III/IV Single ECM Troubleshooting

Section 11.3 Troubleshooting Flash Code 11

Section 11.3
Troubleshooting Flash Code 11

The following procedure will troubleshoot Flash Code 11.‪

Section 11.3.1
Multiple Code Check

Perform the following steps to check for multiple codes.‪

  1. Turn vehicle ignition switch ON.
  2. Plug in DDR.
  3. Read active codes.
    1. If code 187/4 is logged and there are no VSG controls used, call DDC with the engine serial number to determine if re-calibration is necessary.
    2. If code 187/4 was logged and there are VSG controls used primarily, refer to "11.3.2 Sensor Wiring Check" .
    3. If codes 100/4 and 91/4 were logged, refer to "91.2 Troubleshooting Vehicle Harness +5 Volt Supply" .

Section 11.3.2
Sensor Wiring Check

Perform the following steps to check the sensor and wiring:‪

  1. Turn ignition OFF.
  2. Disconnect VSG throttle sensor connector.
  3. Install a jumper wire between sockets B (#510 signal) and C (5V - #916) of the VSG harness connector. See Figure "Variable Speed Governor Circuit" .

    Note: Cavities of throttle controls may vary depending on the OEM.

  4. Turn ignition ON.
  5. Enable VSG throttle. Refer to OEM guidelines.
  6. Read DDR for active codes.
    1. If active code 187/3 and any other codes are logged, refer to "11.3.3 Check Hand Throttle Sensor Adjustment" .
    2. If active code 187/4 and any other codes are logged, refer to "11.3.6 Check for +5 volts" .
    3. Click to see this graphic in a separate window

      Figure 1. Variable Speed Governor Circuit

Section 11.3.3
Check Hand Throttle Sensor Adjustment

Perform the following steps to check the hand throttle sensor:‪

  1. Remove jumper and reconnect hand throttle sensor.
  2. Turn ignition ON.
  3. Plug in DDR.
  4. Select VSG COUNTS on the DDR.
  5. Enable VSG. Set to idle position.
  6. Read counts.
    1. If the count value set at idle (minimum throttle) is greater than 48 counts, refer to "11.3.5 Check Hand Throttle Sensor Connectors" .
    2. If the count value set at idle (minimum throttle) is less than 48 counts, refer to "11.3.4 Adjust Hand Throttle Sensor" .

Section 11.3.4
Adjust Hand Throttle Sensor

Perform the following steps to adjust the hand throttle sensor:‪

  1. Turn ignition OFF.
  2. If a variable hand throttle sensor is installed, adjust idle position (low-speed) stops on the hand throttle sensor.
  3. If fixed resistors are installed, replace with new resistors. (Minimum counts MUST be greater than 48.)
  4. Turn ignition ON.
  5. Read VSG counts with throttle at low-speed position.
    1. If the idle count reading is greater than 48 counts, refer to "11.3.12 Verify Repair" .
    2. If the idle count reading is less than 48 counts, refer to "11.3.5 Check Hand Throttle Sensor Connectors" .

Section 11.3.5
Check Hand Throttle Sensor Connectors

Perform the following steps to check the hand throttle sensor connectors.‪

  1. Turn ignition OFF.
  2. Inspect the terminals at the hand throttle sensor connectors (sensor side and harness side) for bent, corroded and unseated pins or sockets. See Figure "Variable Speed Governor Circuit" .
    1. If the terminals and connectors are not damaged, replace hand throttle sensor. Refer to "11.3.12 Verify Repair" .
    2. If the terminals and connectors are damaged, repair as necessary. Refer to "11.3.12 Verify Repair" .
    3. Click to see this graphic in a separate window

      Figure 2. Variable Speed Governor Circuit

Section 11.3.6
Check for +5 volts

Perform the following steps to check for +5 volts:‪

  1. Turn ignition ON.
  2. Enable VSG. Refer to OEM guidelines.
  3. Measure voltage on the hand throttle sensor harness connector, socket C (5V #916, red lead) to socket A (return #952, black lead). See Figure "Variable Speed Governor Circuit" .
    1. If the voltage reading is between 4 to 6 volts, refer to "11.3.7 Check for Short" .
    2. If the voltage reading is greater than 6 volts, refer to "12.1 Description of Flash Code 12" .
    3. If the voltage reading is less than 4 volts, refer to "11.3.10 Check for Short to 5 Volt" .
    4. Click to see this graphic in a separate window

      Figure 3. Variable Speed Governor Circuit

Section 11.3.7
Check for Short

Perform the following steps to check for a short:‪

  1. Turn ignition OFF.
  2. Disconnect the vehicle harness connector at the ECM.
  3. Enable VSG. Refer to OEM guidelines.
  4. Measure resistance between sockets A (return #952) and B (signal #525) on the hand throttle sensor harness connector. For VSG circuit, see Figure .
    1. If the resistance is greater than 1,000 Ω or open, refer to "11.3.8 Check for Open Signal" .
    2. If the resistance is less than or equal to 1,000 Ω, the signal line #525 is shorted to the return line. Repair the short. Refer to "11.3.12 Verify Repair" .
    3. Click to see this graphic in a separate window

      Figure 4. Variable Speed Governor Circuit

Section 11.3.8
Check for Open Signal

Perform the following steps to check for open signal:‪

  1. Install a jumper wire between sockets A and B of the hand throttle sensor harness connector. See Figure "Variable Speed Governor Circuit" .
  2. Enable VSG. Refer to OEM guidelines.
  3. Measure resistance between sockets D1 (#510) and C3 (#952) on the vehicle harness connector.
    1. If the resistance is less than or equal to 5 Ω, refer to "11.3.9 Check ECM Connectors" .
    2. If the resistance is greater than 5 Ω or open and the signal line (#510) or return line (#952) is open, repair the open. Refer to "11.3.12 Verify Repair" .

Section 11.3.9
Check ECM Connectors

Perform the following steps to check for signal open:‪

  1. Check terminals at the ECM vehicle harness connector (both the ECM and harness side) for bent, corroded, and unseated pins or sockets. See Figure "Electronic Control Module Vehicle Harness Connector" .
    1. If the terminals and connectors are damaged, repair the terminals, connectors, or both. Refer to "11.3.12 Verify Repair" .
    2. If the terminals and connectors are not damaged, contact DDC Technical Service. Refer to "11.3.12 Verify Repair" .
    3. Click to see this graphic in a separate window

      Figure 5. Electronic Control Module Vehicle Harness Connector

Section 11.3.10
Check for Short to 5 Volt

Perform the following steps to check for a short:‪

  1. Turn ignition OFF.
  2. Disconnect the vehicle harness connector at the ECM.
  3. Disconnect the connector at the hand throttle sensor.
  4. Measure resistance between sockets A and C on the hand throttle sensor harness connector. See Figure "Variable Speed Governor Circuit" .
    1. If the resistance measurement is greater than 1,000 Ω, refer to "11.3.11 Check for Open +5 Volt Line" .
    2. If the resistance measurement is less than or equal to 1,000 Ω, the vehicle +5 volt line (#916) is shorted to the return line (#952). Repair short. Refer to "11.3.12 Verify Repair" .
    3. Click to see this graphic in a separate window

      Figure 6. Variable Speed Governor Circuit

Section 11.3.11
Check for Open +5 Volt Line

Perform the following steps to check for an open +5 volt line. ‪

  1. Install a jumper wire between sockets A and C of the hand throttle sensor harness connector. See Figure "Variable Speed Governor Circuit" .
  2. Measure resistance between sockets A3 (#916) and C3 (#952) on the vehicle connector.
    1. If the resistance measurement is less than or equal to 5 Ω, refer to "11.3.9 Check ECM Connectors" .
    2. If the resistance measurement is greater than 5 Ω, or open, the vehicle +5 volt line (#916) is open. Repair open. Refer to "11.3.12 Verify Repair" .

Section 11.3.12
Verify Repair

Perform the following steps to verify repairs:‪

  1. Turn ignition OFF.
  2. Reconnect all connectors.
  3. Turn ignition ON.
  4. Clear codes.
  5. Start and run the engine for one minute.
  6. Stop engine.
  7. Check for logged codes.
    1. If no codes are logged, troubleshooting is complete.
    2. If code 187/4 is not logged, and other codes are logged, refer to "9.1 First Step for Diagnosing a Fault Within the DDEC System" .
    3. If code 187/4 is logged, and other codes are logged, systems diagnostics are complete. Please review this section from the first step to find the error. Refer to "11.3.1 Multiple Code Check" .


DDEC III/IV Single ECM Troubleshooting Guide - 6SE497
Generated on 10-13-2008

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