PGM-FI Control System — Troubleshooting Flowchart — TA Sensor (cont'd)
6-49flowchart1
(From page 6-48)
2
Is there approx. 5 V?
YES
Measure voltage between RED/YEL (+) terminal and GRN/WHT (-) terminal.
Measure voltage between RED/YEL (+) terminal and GRN/WHT (-) terminal.
Is there approx. 5 V?
NO
3
Turn the ignition switch OFF.
4
Connect the PGM-FI test harness between the ECU and connector (page 6-19).
5
Turn the ignition switch ON.
6
Measure voltage between C5 (+) terminal and C12 (-) terminal.
7
Is there approx. 5 V?
YES
Repair open in RED/YEL wire between ECU (C5) and TA sensor.
NO
8
Disconnect "C" connector from the main wire harness only, not the ECU.
9
Measure voltage between C5 (+) terminal and C12 (-) terminal.
10
Is there approx. 5 V?
NO
Substitute a known-good ECU and recheck. If prescribed voltage is now available, replace the original ECU.
YES
11
Repair short in RED/YEL wire between ECU (C5) and TA sensor.