Troubleshooting Flash Code 81, PID 173/FMI 3
Typically, the exhaust gas temperature circuit failed high is caused by an open signal or short to battery +. Perform the following procedures to troubleshoot code p 173/3.
Check for Open and Short
Check for open as follows:
- Disconnect the Exhaust Temperature Sensor connector.
- Install a jumper wire between the two pins at the ET Sensor. See Figure "Exhaust Temperature Sensor" .
- Unplug the vehicle harness connector at the ECM/ECU.
- Measure resistance between V-60 of the VIH connector and V-23 connector; see Figure "Exhaust Temperature Sensor" .
- Remove the jumper and measure resistance again between V-60 and V-23; see Figure
"Exhaust Temperature Sensor"
Figure 1. Exhaust Temperature Sensor
- If the reading is greater than 400 Ω, the resistor between circuit V-60 and V-23 has failed. Replace the resistor or replace the harness.
- If the reading is less than 400 Ω, replace the ETS, and refer to "188.8.131.52 Verify Repair" .
Perform the following steps to test the repair:
- Connect all removed connectors. Start and run the engine.
- Perform road test.
- Plug in diagnostic tool and read active codes.
- If no codes display, repairs are complete.
- If code 81 displays, review the procedure for checking exhaust gas temperature circuit failed high; refer to "73.5.1 Check for Open and Short" . If this is the second time through the procedure, call the DDC Customer Support Center (313–592–5800) or try a test ECM/ECU.
|Series 60 DDEC V Troubleshooting Guide - 6SE570|
|Generated on 10-13-2008|