Series 60 DDEC V Troubleshooting

Section 44.2 Troubleshooting Flash Code 41, SID 21/FMI 0

Section 44.2
Troubleshooting Flash Code 41, SID 21/FMI 0

The following procedure will troubleshoot Flash Code 41.‪

Section 44.2.1
Check for Signal Open

Perform the following steps to check for signal open.‪

  1. Turn ignition OFF.
  2. Disconnect Engine Harness connector at the ECM/ECU. See Figure "Engine Harness Connector" .
  3. Read resistance between sockets E-17 and E-18 on the Engine Harness connector.
    1. If the resistance reading is less than or equal to 135 Ω, refer to "44.2.2 Check for Short" .
    2. If the resistance reading is greater than 136 Ω or open, refer to "44.2.3 Open Crankshaft Position Sensor Line Check" .
    3. Click to see this graphic in a separate window

      Figure 1. Engine Harness Connector

Section 44.2.2
Check for Short

Perform the following steps to check for a short.‪

  1. Disconnect the TRS/CKP connector.
  2. Measure resistance between sockets E-17 and E-18 on the Engine Harness connector. See Figure "Engine Harness Connector to Crankshaft Position Sensor" .
  3. Measure resistance between socket E-17 and ground, and between socket E-18 and ground.
    1. If the resistance measurement is greater than 10,000 Ω or open, refer to "44.2.4 Check Crankshaft Position Sensor Resistance and Gap" .
    2. If the resistance measurement is less than or equal to 10,000 Ω, a short exists between E-17 and E-18 or where less than 10,000 Ω resistance was read. Repair the short. Refer to "44.2.8.1 Verify Repairs" .
    3. Click to see this graphic in a separate window

      Figure 2. Engine Harness Connector to Crankshaft Position Sensor

Section 44.2.3
Open Crankshaft Position Sensor Line Check

Perform the following steps to check the open TRS/CKP line.‪

  1. Disconnect the TRS/CKP connector.
  2. Install a jumper wire between sockets 1 and 2 of the TRS/CKP harness connector.
  3. Measure resistance between sockets E-17 and E-18 on the Engine Harness connector.
    1. If the resistance measurement is less than or equal to 5 Ω, refer to "44.2.4 Check Crankshaft Position Sensor Resistance and Gap" .
    2. If the resistance measurement is greater than 5 Ω, or open, the signal line E-18 or return line E-17 is open. Repair the open. Refer to "44.2.8.1 Verify Repairs" .

Section 44.2.4
Check Crankshaft Position Sensor Resistance and Gap

Perform the following steps to check TRS/CKP resistance and TRS/CKP/CMP gap:‪

  1. Measure resistance of TRS/CKP across sensor connector pins 1 and 2. See Figure "Engine Harness Connector to Crankshaft Position Sensor" .
    1. If the resistance measurement is greater than 136 Ω, go to step 4 .
    2. If the resistance measurement is between 100 and 135 Ω, go to go to step 2 .
    3. Click to see this graphic in a separate window

      Figure 3. Engine Harness Connector to Crankshaft Position Sensor

  2. Bar the engine until the TRS/CKP is over a TRS/CKP tooth of the pulse wheel.
  3. Check the gap between TRS/CKP and the tooth of the pulse wheel (0.020 to 0.040 in.). A depth micrometer can be used.
    1. If the gap setting is correct, refer to "44.2.5 Camshaft Position Sensor Check" .
    2. If the gap setting is not correct, adjust the TRS/CKP until the gap setting is correct. If the problem returns, the pulse wheel may be loose or bad or damaged. Refer to "44.2.8.1 Verify Repairs" .
  4. Check terminals at the TRS/CKP (both the TRS/CKP and harness side) for damaged, bent, corroded, and unseated pins or sockets. See Figure "Engine Harness Connector to Crankshaft Position Sensor"
    1. If the terminals and connectors are damaged, repair them. Refer to "44.2.8.1 Verify Repairs" .
    2. If the terminals and connectors are not damaged, replace the TRS/CKP. Refer to "44.2.8.1 Verify Repairs" .

Section 44.2.5
Camshaft Position Sensor Check

Perform the following steps to check the SRS/CMP:‪

  1. Check for SRS/CMP code.
    1. If code 21/1 is not logged, go to step 3 .
    2. If code 21/1 is logged, go to step 2 .
  2. Measure resistance between sockets E-20 and E-19 on the Engine Harness connector. See Figure "Engine Harness Connector to Camshaft Position Sensor" .
    1. If measured resistance is greater than 136 Ω , or open, refer to "44.2.7 Open Camshaft Position Sensor Line Check" .
    2. If measured resistance is less than 135 Ω , or open, refer to "44.2.6 Check for Short" .
    3. Click to see this graphic in a separate window

      Figure 4. Engine Harness Connector to Camshaft Position Sensor

  3. Check terminals at the ECM/ECU Engine Harness connectors (both the ECM/ECU and harness side) for damage: bent, corroded, and unseated pins or sockets.
    1. If terminals and connectors are damaged, repair them. Refer to "44.2.8.1 Verify Repairs" .
    2. If terminals and connectors are not damaged, install a test ECM/ECU. Refer to "44.2.8.1 Verify Repairs" .

Section 44.2.6
Check for Short

Perform the following steps to check for a short.‪

  1. Disconnect the SRS/CMP connector.
  2. Measure resistance between sockets E-19 and E-20 on the Engine Harness connector.
    1. If measured resistance is greater than 10,000 Ω, or open, go to step 3 .
    2. If measured resistance is less than or equal to 10,000 Ω, the signal line E-20 is shorted to the return line E-19. Repair the short. Refer to "44.2.8.1 Verify Repairs" .
  3. Measure resistance of SRS/CMP across the sensor connector pins 1 and 2.
    1. If the measured resistance is greater than 136 Ω, go to step 4 .
    2. If the measured resistance is between 100 and 136 Ω, go to step 5 .
  4. Check terminals at the SRS/CMP (both the SRS/CMP and harness side) for damage: bent, corroded, and unseated pins or sockets, or bad contacts.
    1. If terminals and connectors are damaged, repair them. Refer to "44.2.8.1 Verify Repairs" .
    2. If terminals and connectors are not damaged, replace the SRS/CMP. Refer to "44.2.8.1 Verify Repairs" .
  5. Check terminals at the ECM/ECU Engine Harness connectors (both the ECM/ECU and harness side) for damage: bent, corroded, and unseated pins or sockets.
    1. If terminals and connectors are damaged, repair them. Refer to "44.2.8.1 Verify Repairs" .
    2. If terminals and connectors are not damaged, install a test ECM/ECU. Refer to "44.2.8.1 Verify Repairs" .

Section 44.2.7
Open Camshaft Position Sensor Line Check

Perform the following steps to check for an open SRS/CMP line.‪

  1. Disconnect the SRS/CMP connector.
  2. Install a jumper wire between sockets 1 and 2 of the SRS harness connectors.
  3. Measure resistance between sockets E-19 and E-20 on the Engine Harness connector.
    1. If measured resistance is less than or equal to 5 Ω, go to step 4 .
    2. If measured resistance is greater than 5 Ω, or open, the signal line E-20 or return line E-19 is open. Repair the open and refer to "44.2.8.1 Verify Repairs" .
  4. Measure resistance of SRS/CMP across the sensor connector pins 1 and 2.
    1. If the measured resistance is greater than 136 Ω, go to step 5 .
    2. If the measured resistance is between 100 and 136 Ω, go to step 6 .
  5. Check terminals at the SRS/CMP (both the SRS/CMP and harness side) for damage: bent, corroded, and unseated pins or sockets, or bad contacts.
    1. If terminals and connectors are damaged, repair them. Refer to "44.2.8.1 Verify Repairs" .
    2. If terminals and connectors are not damaged, replace the SRS/CMP. Refer to "44.2.8.1 Verify Repairs" .
  6. Check terminals at the ECM/ECU Engine Harness connectors (both the ECM/ECU and harness side) for damage: bent, corroded, and unseated pins or sockets.
    1. If terminals and connectors are damaged, repair them. Check for code 21/0. If there are no codes, refer to "44.2.8.1 Verify Repairs" . If code s 21/0 appears, refer to "44.2.8 Check Injector Drive Harness for Short" and check the injector harness.
    2. If terminals and connectors are not damaged, install a test ECM/ECU. Check for code s 21/0. If there are no codes, refer to "44.2.8.1 Verify Repairs" . If code s 21/0 appears, refer to "44.2.8 Check Injector Drive Harness for Short" and check the injector harness.

Section 44.2.8
Check Injector Drive Harness for Short

Check the injector drive harness for a short as follows:‪

  1. Disconnect the injector harness 10 pin connector and locate the terminals for each injector position. See Figure "Injector Harness with Jake Brake" .
    Click to see this graphic in a separate window

    Figure 5. Injector Harness with Jake Brake

  2. Measure resistance between that terminal and the cylinder block.
    1. If the measured resistance is less than 5Ω, the wire is shorted to the block. Replace the harness between the 10 pin connector and the ECM/ECU. Refer to "44.2.8.1 Verify Repairs" .
    2. If the measured resistance is greater than 5Ω, call the Detroit Diesel Customer Support Center (313–592–5800).
Section 44.2.8.1
Verify Repairs

Perform the following steps to verify repairs.‪

  1. Turn vehicle ignition OFF.
  2. Reconnect all connectors.
  3. Turn vehicle ignition ON.
  4. Start and run the engine for one minute. Stop engine.
  5. Check diagnostic tool for codes.
    1. If no codes are logged, troubleshooting is complete.
    2. If code s 21/0 is logged, check the injector harness for a short to ground (can cause extra pulses). Refer to Chapter "60 Flash Code 61 - Injector Response Long" , section "60.2.3 Check for Short" , “Check for Short.”
    3. If code s 21/0 and any other codes are logged, and the TRS/CKP or SRS/CMP  was not replaced, refer to "44.2.5 Camshaft Position Sensor Check" .
    4. If code s 21/0 and any other codes are logged and the TRS/CKP or SRS/CMP was replaced, review this section to find the error or contact Detroit Diesel Customer Support Center (313–592–5800).
    5. If any codes except code s 21/0 are logged, refer to "18.3 First Step for Diagnosing a Fault Within the DDEC System" .


Series 60 DDEC V Troubleshooting Guide - 6SE570
Generated on 10-13-2008

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