Code No. P1235: Trustful Check Air Flow Sensor

FUNCTION

Compare the actual measurement of volumetric efficiency by an air flow sensor signal with volumetric efficiency estimated from a throttle position sensor (main or sub) signal.

TROUBLE JUDGMENT

Check Condition

The plausibility error of the throttle position sensor (main) is detected.
The plausibility error of the throttle position sensor (sub) is detected.

Judgement Criterion

The difference between the volumetric efficiency estimated by the throttle position sensor (main) and the volumetric efficiency estimated by the throttle position sensor (sub) is 8.8% or less.

PROBABLE CAUSES

Failed air flow sensor
Harness damage in air flow sensor circuit or loose connector contact
Failed intake air system
Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

Q. Is any other diagnosis code than P1235 output?

	Inspection chart for diagnosis code (Refer to ).

	Go to Step 2 .

STEP 2. M.U.T.-III data list

Refer to Data List Reference Table .

Item 10: Air flow sensor

Q. Is the check result normal?

	Replace the engine-ECU.

	Check air flow sensor system (Refer to Code No. P0102 , P0103 ).