PGM-FI Control System - Troubleshooting Flowchart - TW Sensor (cont'd)
6-43flowchartTW (coolant temperature) sensor troubleshooting, CODE 6 continued from 6-42. Wire colors RED/WHT and GRN/WHT; ECU terminals C6 and C12; connectors C210/C151 and TW sensor 2P connector.
1
(From page 6-42)
2
Reconnect C210 and C151 connectors, then disconnect the 2P connector from TW sensor.
3
Is there approx. 5V?
YES
Measure voltage between RED/WHT (+) terminal and GRN/WHT (-) terminal.
Measure voltage between RED/WHT (+) terminal and GRN/WHT (-) terminal.
Is there approx. 5V?
NO
4
Turn the ignition switch OFF.
5
Connect the PGM-FI test harness between the ECU and connector (page 6-19).
6
Turn the ignition switch ON.
7
Measure voltage between C6 (+) terminal and C12 (-) terminal.
8
Is there approx. 5V?
YES
Repair open in RED/WHT wire between ECU (C6) and TW sensor.
NO
9
Disconnect "C" connector from the main wire harness only, not the ECU.
10
Measure voltage between C6 (+) terminal and C12 (-) terminal.
11
Is there approx. 5V?
NO
Substitute a known-good ECU and recheck. If prescribed voltage is now available, replace the original ECU.
YES
Repair short in RED/WHT wire between ECU (C6) and TW sensor.