Fault Codes: Injector 1 Response Time Long (Code 61/ Detroit Engine)

Detroit Engine - Series 60

Figure 1.1 - Engine Check (Code 61)

DDC Code # (Flashed) = 61

PID = S1

FMI = 0

Fault Description = Injector #1 - Response Time Long

#DESCRIPTION OF FLASH CODE 61

Flash Code 61 indicates that the time it takes from when the DDEC IV ECM requests an Injector be turned on to when the Injector solenoid valve actually closes is longer than the high limit of the expected range. Engine oil temperature must be greater than 87 deg F (30 deg C).

This Diagnostic condition is typically:

→Bad Injector harness and or connection (high resistance)

→Poor vehicle grounds

→Sticky solenoid valve.

Figure 1.2 - Injectors

#NOTE:

The Injector diagnostic SID (Subsystem Identifier) indicates which cylinder number has an Injector with a long response time. The Injector number describes the cylinder and or bank which has the Injector with a long response time. The DDDL will display the Injector text description. Read More: Injector Response Times on Detroit Diesel Diagnostic Link (DDDL) Software.

Figure 1.3 - Injector #1 (Response Time Long)

Injector response times generally increase with low battery supply voltage and decrease with high battery supply voltage. Although Injector response times vary from Injector to Injector at a given r/min, each individual Injector response time should remain relatively consistent from one firing to the next. Wide variations in response time (typically ± 0.2 msec) for one Injector at a steady Engine r/min may indicate an electrical problem (faulty Alternator or voltage regulator, poor or broken ground cables, etc).

#TROUBLESHOOTING FLASH CODE 61

The following procedure will troubleshoot Flash Code 61.

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 deg F (30 deg C).

3. Does the code return?

→If flash code 61 does not return, repair or replace the alternator grounds and refer to "Verify Repairs".

→If the code(s) return, refer to "Determine Cylinders with Fault".

2). Determine Cylinders with Fault

The Injector location that is logging the codes is listed as below.

Figure 1.4 - Series 55/60 and 50

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.

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.

→If any terminals have a resistance of less than 1,000, replace the ECM. Refer to "Verify Repairs".

→If all terminals have a resistance of greater than 1,000, refer to "Check for Short".

3). Check for Short

Perform the following steps to check for a short.

1. Locate the Injector harness connector terminals associated with the codes.

2. Measure resistance between that cavity and the cylinder block.

→If measured resistance is less than 10, the wire is shorted to the Engine. Repair or replace the harness and refer to "Verify Repairs".

→If measured resistance is greater than 10, 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).

→If measured resistance is less than 5, the wire is shorted to the return wire. Repair or replace the harness and refer to "Verify Repairs".

→If measured resistance is greater than 5, refer to section "Check for Open".

Figure 1.5 - Injector Harness

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).

→If the measured resistance is greater than 5, the Injector wire is open. Repair or replace the harness and refer to "Verify Repairs".

→If the measured resistance is less than 5, and the ECM software is less than 3.00, reprogram the ECM. Refer to "Verify Repairs".

5). Verify Repairs

Perform the following steps to verify repairs:

1. Start and run the Engine. Warm to 87 deg F (30 deg C).

2. Check DDDL for codes. Read More: How to Connecting DETROIT Engine using Detroit Diesel Diagnostic Link (DDDL).

→If Injector codes are logged, please review this section from the first step to find the problem. Refer to "Determine Cylinders with Fault".

→If no codes are logged, no further troubleshooting is required.

Read More:

Graph Page on Detroit Diesel Diagnostic Link (DDDL) Software

ECM I/O Configuration on Detroit Diesel Diagnostic Link (DDDL) Software

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