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DTC DETECTING CONDITION AND TROUBLE AREA
DTC DETECTING CONDITION
DTC will be set when all of the following conditions are
detected for 5 seconds continuously.
• Engine is running
• Current of MAF sensor output is less than the specified
value for the specified time continuously.
DTC CONFIRMATION PROCEDURE
1) With ignition switch turned OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Start engine and run it for 10 sec.
4) Check DTC and pending DTC.
TROUBLESHOOTING
Step
1
Was "Engine and Emission Control System Check" per-
formed?
2
MAF Sensor Check.
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Start engine and check MAF value displayed on scan
tool. (Refer to "Scan Tool Data" in this section for nor-
mal value.)
Is normal value indicated?
3
Check MAF sensor power supply voltage.
1) Disconnect connector from MAF sensor with ignition
switch turned OFF.
2) Turn ON ignition switch, measure voltage between
engine ground and "BLK/RED" wire terminal of MAF
sensor connector.
Is voltage 10 – 14 V?
4
Check MAF sensor ground circuit.
1) Measure resistance between "ORN" wire terminal of
MAF sensor connector and engine ground.
Is resistance below 5 Ω?
5
Check ground circuit.
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Remove ECM from vehicle body and connect connec-
tors to ECM.
3) Measure resistance between "C63-28" terminal of
ECM connector and vehicle body ground.
Is resistance below 5 Ω?
Action
ENGINE GENERAL INFORMATION AND DIAGNOSIS 6-71
TROUBLE AREA
• Open or short in MAF sensor circuit
• MAF sensor
• ECM
Yes
Go to Step 2.
Intermittent trouble.
Check for intermit-
tent referring to
"Intermittent and
Poor Connection" in
Section 0A.
Go to Step 4.
Go to Step 6.
"ORN" wire in open
or high resistance
circuit.
No
Go to "Engine and
Emission Control
System Check" in
this section.
Go to Step 3.
"BLK/RED" wire in
open circuit.
Go to Step 5.
ECM grounds "C63-
1", "C64-1" and/or
"C64-2" circuit open
or high resistance.
If wires are OK, sub-
stitute a known-good
ECM and recheck.
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