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.
- Disable the alternator by removing the alternator belt.
- Start and run the engine; warm to greater than 87°F (30°C).
- Does the code return?
- If Flash Code 61 does not return, repair or replace the alternator grounds and refer to "61.3.5 Verify Repairs" .
- 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 # |
- Disconnect the 5-pin injector harness connector at the ECM for those injectors logging the codes.
- 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.
- 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.
- Measure the resistance. Repeat this procedure at each of the five terminals.
- If any terminals have a resistance of less than 1,000 Ω, replace the ECM. Refer to "61.3.5 Verify Repairs" .
- 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.
- Locate the injector harness connector terminals associated with the codes. See Figure "Injector Harness" .
- Measure resistance between that cavity and the cylinder block.
- 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" .
- If measured resistance is greater than 10 Ω, go to step 3.
- Remove the valve cover to gain access to the cylinder associated with the code.
- Remove the connector terminals at the injector solenoid(s).
- Measure resistance between that cavity and the appropriate return cavity (G or E).
- 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" .
- If measured resistance is greater than 5 Ω, refer to "61.3.4 Check for Open" .
Figure 1. Injector Harness
Section 61.3.4
Check for Open
Perform the following steps to check for an open.
- Insert a jumper wire between the cavity associated with the code and the return for that connector (G or E).
- Measure resistance across the injector connectors (disconnected from injector solenoid).
- 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" .
- 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" .
- 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:
- Start and run the engine. Warm to 87°F (30°C).
- Check DDR for codes.
- 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" .
- If no codes are logged, no further troubleshooting is required.
DDEC III/IV Single ECM Troubleshooting Guide - 6SE497 |
Generated on 10-13-2008 |