Series 60 DDEC V Troubleshooting

Section 45.2 Troubleshooting Flash Code 42, SID 21/FMI 1

Section 45.2
Troubleshooting Flash Code 42, SID 21/FMI 1

The following procedure will troubleshoot Flash Code 42.‪

Section 45.2.1
Resistance Check

Perform the following steps to check resistance.‪

  1. Turn vehicle ignition OFF.
  2. Disconnect Engine Harness connector at ECM/ECU.
  3. Measure resistance between sockets E-19 and E-20 on the Engine Harness connector. See Figure "ECM/ECU Engine Harness Connector" .
    1. If the resistance measurement is less than or equal to 135Ω, refer to "45.2.2 Check for Short" .
    2. If the resistance measurement is greater than 136Ω or open, refer to "45.2.3 Open Camshaft Position Sensor Line Check" .
    3. Click to see this graphic in a separate window

      Figure 1. ECM/ECU Engine Harness Connector

Section 45.2.2
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. See Figure "ECM/ECU Engine Harness Connector" .
  3. Measure resistance between socket E-19 and ground, and between socket E-20 and ground.
    1. If the resistance measurement is less than or equal to 10,000 Ω, a short exists. Repair the short. Refer to "45.2.13.1 Verify Repairs" .
    2. If the resistance measurement is greater than 10,000 Ω, or open, refer to "45.2.4 Camshaft Position Sensor and Sensor ConnectorsTest" .

Section 45.2.3
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/CMP harness connector. See Figure "Engine Harness Connector to Camshaft Position Sensor" .
  3. Measure resistance between sockets E-19 and E-20 on the Engine Harness connector.
    1. If the resistance measurement is less than or equal to 5 Ω, refer to "45.2.4 Camshaft Position Sensor and Sensor ConnectorsTest" .
    2. If the resistance measurement is greater than 5 Ω or open, the signal line (E-20) or return line (E-19) is open. Repair the open. Refer to "45.2.13.1 Verify Repairs" .
    3. Click to see this graphic in a separate window

      Figure 2. Engine Harness Connector to Camshaft Position Sensor

Section 45.2.4
Camshaft Position Sensor and Sensor ConnectorsTest

Perform the following steps to test the SRS/CMP. ‪

  1. Measure resistance of SRS/CMP across the sensor connector pins 1 and 2.
    1. If the resistance measurement is less than or equal to 100 Ω or greater than 136 Ω, go to step 2 .
    2. If the resistance measurement is between 100 and 135 Ω, refer to "45.2.5 Check Camshaft Position Sensor Gap" .
  2. Check terminals at the SRS/CMP (both the SRS/CMP and harness side) for damage: bent, corroded, and unseated pins or sockets, or a bad contact. See Figure "Engine Harness Connector to Camshaft Position Sensor"
    1. If terminals and connectors are damaged, repair them. Refer to "45.2.13.1 Verify Repairs" .
    2. If terminals and connectors are not damaged, replace the SRS/CMP. Refer to "45.2.12 Verify Crankshaft Position Sensor / Camshaft Position Sensor" .

Section 45.2.5
Check Camshaft Position Sensor Gap

Perform the following steps to check the SRS/CMP gap.‪

  1. Bar engine until SRS/CMP is over the SRS/CMP pin.
  2. Check the gap between SRS/CMP and the pin.
    1. If the gap setting is correct 0.508-1.016 mm (0.020 - 0.040 in.), refer to "45.2.6 Check for Crankshaft Position Sensor Code" . A depth micrometer can be used.
    2. If the gap setting is not correct, inspect for a loose or missing pin in the the bull gear and repair as necessary. Following repairs, refer to "45.2.13.1 Verify Repairs" .

Section 45.2.6
Check for Crankshaft Position Sensor Code

Perform the following steps to check for TRS/CKP code.‪

  1. If code 21/0 is not logged, go to step 2 . If code 21/0 is logged, refer to "45.2.7 Crankshaft Position Sensor Resistance Check" .
  2. 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 "45.2.13.1 Verify Repairs" .
    2. If terminals and connectors are not damaged, refer to "45.2.13 Verify Cranking Voltage" .

Section 45.2.7
Crankshaft Position Sensor Resistance Check

Perform the following steps to check TRS/CKP resistance.‪

  1. Remove the Engine Harness 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" .
    1. If the resistance measurement is greater than 136 Ω, refer to "45.2.9 Open Crankshaft Position Sensor Line Check" .
    2. If the resistance measurement is less than or equal to 135 Ω, refer to "45.2.8 Check for Short" .
    3. Click to see this graphic in a separate window

      Figure 3. Engine Harness Connector to Crankshaft Position Sensor

Section 45.2.8
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.
    1. If measured resistance is greater than 10,000 Ω, or open, refer to "45.2.10 Crankshaft Position Sensor and Sensor Connectors Test" .
    2. If measured resistance is less than or equal to 10,000 Ω, the signal line (E-18) is shorted to the return line (E-17). Repair the short. Refer to "45.2.13.1 Verify Repairs" .

Section 45.2.9
Open Crankshaft Position Sensor Line Check

Perform the following steps to check for an 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. See Figure "Engine Harness Connector to Crankshaft Position Sensor" .
  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 "45.2.10 Crankshaft Position Sensor and Sensor Connectors Test" .
    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 "45.2.13.1 Verify Repairs" .

Section 45.2.10
Crankshaft Position Sensor and Sensor Connectors Test

Perform the following steps to test the TRS/CKP.‪

  1. Measure resistance of TRS/CKP across the sensor connector pins 1 and 2.
    1. If the resistance measurement is greater than 136 Ω or less than 100 Ω, go to step 2 .
    2. If the resistance measurement is between 100 and 135 Ω, refer to "45.2.6 Check for Crankshaft Position Sensor Code" and go to step 2 .
  2. Check terminals at the TRS/CKP (both the TRS/CKP and harness end) for damage: bent, corroded, and unseated pins or sockets or bad contacts. See Figure "Engine Harness Connector to Crankshaft Position Sensor" .
    Click to see this graphic in a separate window

    Figure 4. Engine Harness Connector to Crankshaft Position Sensor

    1. If terminals and connectors are damaged, repair them. Check for code s 21/1. If there are no codes, refer to "45.2.13.1 Verify Repairs" . If code s 21/1 appears, refer to "45.2.11 Check the Injector Drive Harness for Short" .
    2. If terminals and connectors are not damaged, replace the TRS/CKP. Check for code s 21/1. If there are no codes, refer to "45.2.12 Verify Crankshaft Position Sensor / Camshaft Position Sensor" . If code s 21/1 appears, refer to "45.2.11 Check the Injector Drive Harness for Short" .

Section 45.2.11
Check the 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 "45.2.12 Verify Crankshaft Position Sensor / Camshaft Position Sensor" .
    2. If the measured resistance is greater than 5Ω, call the Detroit Diesel Customer Support Center (313–592–5800).

Section 45.2.12
Verify Crankshaft Position Sensor / Camshaft Position Sensor

Perform the following steps to verify operation of the CKP/CMP.‪

  1. Turn the vehicle ignition OFF, reconnect all connectors and clear codes.
  2. Start and run the engine for one minute. Stop the engine.
  3. Check diagnostic tool for codes.
    1. If no codes are logged, troubleshooting is complete.
    2. If any codes except code s 21/1 are logged, refer to "18.3 First Step for Diagnosing a Fault Within the DDEC System" .
    3. If code s 21/1 and any other codes are logged, and the CMP was not replaced, refer to "45.2.6 Check for Crankshaft Position Sensor Code" .
    4. If code 21/1 and any other codes are logged, and the CMP was replaced, refer to "45.2.13 Verify Cranking Voltage" .

Section 45.2.13
Verify Cranking Voltage

Perform the following steps to verify cranking voltage.‪

  1. Turn vehicle ignition OFF, connect all connectors.
  2. Connect 12 volt from a fully charged battery power connector.
  3. Connect to ECM/ECU.
  4. Start the engine.
    1. If the engine starts, check the battery. If a voltage equalizer is installed, check the operation of the equalizer. If the equalizer is not working, refer to "45.2.13.1 Verify Repairs" .
    2. If the engine does not start, replace the ECM/ECU. Refer to "45.2.13.1 Verify Repairs" .
Section 45.2.13.1
Verify Repairs

Perform the following steps to verify repairs.‪

  1. Turn vehicle ignition OFF, reconnect all connectors.
  2. Turn vehicle ignition ON and clear codes.
  3. Start and run the engine for one minute. Stop the engine.
  4. Check the diagnostic tool for codes.
    1. If no codes are logged, troubleshooting is complete.
    2. If code s 21/1 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 21/1 and any other codes are logged, review this section to find the error or call the Customer Support Center (313–592–5800).
    4. If any codes except code s 21/1 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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