DDEC III/IV Single ECM Troubleshooting

Section 61.3 Troubleshooting Flash Code 61

Section 61.3
Troubleshooting Flash Code 61

The following procedure will troubleshoot Flash Code 61.‪

Section 61.3.1
Test Alternator Ground

Perform the following steps to test alternator ground.‪

  1. Disable the alternator by removing the alternator belt.
  2. Start and run the engine; warm to greater than 87°F (30°C).
  3. Does the code return?
    1. If Flash Code 61 does not return, repair or replace the alternator grounds and refer to "61.3.5 Verify Repairs" .
    2. If the code(s) return, refer to "61.3.2 Determine Cylinders With Fault" .

Section 61.3.2
Determine Cylinders With Fault

The injector location that is logging the codes is listed in Table "Determine Cylinders With Fault" .‪

#1

#2

#3

#4

#5

#6

(SID 1)

(SID 2)

(SID 3)

(SID 4)

(SID 5)

(SID 6)

S55/60‪

1‪

5‪

3‪

6‪

2‪

4‪

cyl #‪

S50‪

1‪

3‪

4‪

2‪

-‪

-‪

cyl #‪

Table 1. Determine Cylinders With Fault
  1. Disconnect the 5-pin injector harness connector at the ECM for those injectors logging the codes.
  2. Establish a good ECM case ground by measuring the resistance across two points on the ECM. The resistance should measure less than or equal to 1 Ω.
  3. Once a good case ground is established, keep one of the measurement probes in place and move the other probe to one of the five exposed male injector terminals on the ECM.
  4. Measure the resistance. Repeat this procedure at each of the five terminals.
    1. If any terminals have a resistance of less than 1,000 Ω, replace the ECM. Refer to "61.3.5 Verify Repairs" .
    2. If all terminals have a resistance of greater than 1,000 Ω, refer to "61.3.3 Check for Short" .

Section 61.3.3
Check for Short

Perform the following steps to check for a short.‪

  1. Locate the injector harness connector terminals associated with the codes. See Figure "Injector Harness" .
  2. Measure resistance between that cavity and the cylinder block.
    1. If measured resistance is less than 10 Ω, the wire is shorted to the engine. Repair or replace the harness and refer to "61.3.5 Verify Repairs" .
    2. If measured resistance is greater than 10 Ω, go to step 3.
  3. Remove the valve cover to gain access to the cylinder associated with the code.
  4. Remove the connector terminals at the injector solenoid(s).
  5. Measure resistance between that cavity and the appropriate return cavity (G or E).
    1. If measured resistance is less than 5 Ω, the wire is shorted to the return wire. Repair or replace the harness and refer to "61.3.5 Verify Repairs" .
    2. If measured resistance is greater than 5 Ω, refer to "61.3.4 Check for Open" .
    3. Click to see this graphic in a separate window

      Figure 1. Injector Harness

Section 61.3.4
Check for Open

Perform the following steps to check for an open.‪

  1. Insert a jumper wire between the cavity associated with the code and the return for that connector (G or E).
  2. Measure resistance across the injector connectors (disconnected from injector solenoid).
    1. If the measured resistance is greater than 5 Ω, the injector wire is open. Repair or replace the harness and refer to "61.3.5 Verify Repairs" .
    2. If the measured resistance is less than 5 Ω, and the ECM software is less than 3.00, reprogram the ECM. Refer to "61.3.5 Verify Repairs" .
    3. If the measured resistance is less than 5 Ω, and the ECM software is greater than 3.00, replace the injector.

Section 61.3.5
Verify Repairs

Perform the following steps to verify repairs:‪

  1. Start and run the engine. Warm to 87°F (30°C).
  2. Check DDR for codes.
    1. If injector codes are logged, please review this section from the first step to find the problem. Refer to "61.3.2 Determine Cylinders With Fault" .
    2. If no codes are logged, no further troubleshooting is required.


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

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