Series 60 DDEC V Troubleshooting – Section 74.5 Troubleshooting Flash Code 82, PID 173/FMI 4

Section 74.5
Troubleshooting Flash Code 82, PID 173/FMI 4

For all EGR related codes, always perform the “Exhaust Gas Recirculation System Basic Checks.” Refer to "20.18 Exhaust Gas Recirculation System Basic Checks for Series 60 Engines" . Follow these procedures to troubleshoot exhaust gas temperature.‪

Section 74.5.1
Check for Open

Typically, the exhaust gas temperature circuit failed low is caused by an open signal or short to battery+. Perform the following steps to troubleshoot code p 173/4:‪

1. Disconnect the ETS connector.
2. Install a jumper wire between the two pins at the ETS. See Figure "Exhaust Temperature Sensor Wiring" .
   

   Figure 1. Exhaust Temperature Sensor Wiring

3. Unplug vehicle harness connector at the ECM/ECU.
4. Measure resistance between V-23 and V-60. See Figure "Exhaust Temperature Sensor Wiring" .
   1. If resistance measures < 5 Ω, refer to "74.5.2 Check for Short" .
   2. If resistance is > 5 Ω, either the circuit V-60 is opened, or V-23 is opened. Repair the open or replace the wire and test. Refer to "74.5.3.1 Verify Repair" .

Section 74.5.2
Check for Short

Perform the following steps to check for a short: ‪

1. Remove the jumper.
2. Measure resistance again between V-23 and V-60. See Figure "Exhaust Temperature Sensor Wiring" .
   1. If the reading is > 400 Ω, the resistor between circuit V-60 and V-23 has failed. Replace the resistor or replace the harness.
   2. If the reading is < 400 Ω, replace the ETS, and refer to "74.5.3 Check for Short to Ground" .

Section 74.5.3
Check for Short to Ground

Perform the following steps to check for short to ground:‪

1. Measure the resistance between cavity V-23 and ground (battery and block). See Figure "Exhaust Temperature Sensor Wiring" .
2. Measure the resistance between cavity V-60 and ground (battery and block).
   1. If any readings are less than 5 Ω, that wire is shorted to ground. Repair or replace the wire and test. Refer to "74.5.3.1 Verify Repair" .
   2. If both readings are greater than 5 Ω, replace ETS and test. Refer to "74.5.3.1 Verify Repair" .

Section 74.5.3.1
Verify Repair

‪

Perform the following steps to test and verify the repair:‪

1. Connect all removed connectors.
2. Start and run the engine.
3. Perform road test.
4. Plug in diagnostic tool and read active codes.
   1. If no codes display, repairs are complete.
   2. If code 81 displays, review the procedure for checking exhaust gas temperature circuit failed high; refer to "74.5.1 Check for Open" . If this is the second time through the procedure, call the Customer Support Center (313–592–5800) or try a test ECM/ECU.