PGM-FI Troubleshooting Flowchart (sensor CODE / short-to-ground check)
6-23flowchartPA sensor step applies Except KQ model; IMA sensor step applies to Without CATA. YEL/RED wire = ECU C15 to MAP sensor; YEL/WHT = ECU C13 to PA/throttle angle sensor or IMA sensor.
1
Turn the ignition switch OFF.
2
Disconnect the 3P connector of each sensor one at a time: MAP sensor; Throttle angle sensor; PA sensor (Ex. KQ); IMA sensor (Without CATA)
3
Start the engine.
4
Does LED indicate the CODE for the sensor disconnected?
NO
Replace the sensor that did not cause the CODE to appear upon its disconnection.
YES
5
Reconnect all connectors.
6
Turn the ignition switch OFF.
7
Connect the PGM-FI test harness between the ECU and connector (page 6-19). Disconnect "C" connector from ECU only, not the main wire harness.
8
Check for continuity between the body ground and the following terminals individually: C13; C15
9
Does continuity exist?
NO
Substitute a known-good ECU and recheck. If symptom/indication goes away, replace the original ECU.
YES
10
- Repair short to ground in YEL/RED wire between ECU (C15) and MAP sensor. - Repair short to ground in YEL/WHT wire between ECU (C13) and PA sensor (Ex. KQ) or throttle angle sensor. - Repair short to ground in YEL/WHT wire between ECU (C13) and IMA sensor (Without CATA)
(From page 6-22)