Engine Control System

DTC 23 Air Flow Sensor Diagnostic Chart:

Air Flow Sensor Circuit:

DIAGNOSTIC CHART AND DIAGRAM


1. CHECK INPUT SIGNAL FOR ECU.
1) Turn ignition switch to "ON".
2) Measure voltage between ECU connector terminals and body.


Connector & Terminal/Specified value
(B60) No. 11 - Body/10 - 13 V
(B60) No. 5 - Body/0 - 0.3 V
(B60) No. 6 - Body/0 - 0 V


3) Measure voltage between ECU connector terminals and body with engine idling.

Connector & Terminal/Specified value
(B60) No. 11 - Body/13 - 14 V
(B60) No. 5 - Body/O.3 - 1.2 V
(B6O) No. 6 - Body/0 - 0 V

Air Flow Sensor And ECM Connectors:

2. CHECK HARNESS CONNECTOR BETWEEN ECU AND AIR FLOW SENSOR.

1) Turn ignition switch to "OFF".
2) Disconnect connector from ECU and air flow sensor.
3) Measure resistance of harness connector between ECU and air flow sensor.

Connector & Terminal/Specified value
(B60) No. 11 - (B1) No. 5/0 ohm
(B60) No. 4 - (B1) No. 3/0 ohm
(B6O) No. 5 - (B1) No. 2/0 ohm
(B60) No. 6 - (B1) No. 1/0 ohm