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TROUBLE DIAGNOSES
DIAGNOSTIC PROCEDURE 18
-
CODE 32
-
AIR FLOW METER (VOLTAGE LOW).
Wiring Circuit shown with Code 33.
CODE
32
I S
SET IF:
(1)
No TPS errors have been flagged
AND
(2) If the air flow sensor voltage is
<
1.9 volts
AN D
(3) Throttle is not closed while vehicle moving
AND
(4)
The above condition occurs for more than 2 seconds
Clear codes.
lgnition "off'', clear codes.
Diagnostic bridge=
inserted.
Start the engine.
Idle for 1 minute or till ECM light comes on.
Stop engine and insert diagnostic bridge.
lgnition "on", engine stopped, read code.
I
Code 32
I
I
Leave idling engine.
Check voltage on AN16 to AN15 using
multimeter at AFM terminals 3 and 2.
Is the voltaae-?
Problem is intermittent
check for poor electrical
connection in AFM circuit.
Check voltage across ECU
terminals 32 and 30.
Is the voltage-?
ECM faulty.
circuit.
Stop engine.
Check for short on
AN16 to ground.
Fix short
circuit.
Continue to monitor voltage on
AN16 to AN15.
Rev engine to 2000-3000 rpm.
Does voltage rise.
Check for:
AFM faulty.
Air leaks.
ECM faulty.
lgnition "on'', not running.
Check voltage on AN139
to ground AN127.
Repair AN139
Clear codes, run engine for 2 minutes and recheck for codes.
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