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6-68 ENGINE GENERAL INFORMATION AND DIAGNOSIS
NOTE:
Check to make sure that the following conditions are satisfied when using this DTC CONFIRMATION
PROCEDURE.
• Intake air temperature: –7°C (19.4°F) or higher
• Engine coolant temperature: –7°C (19.4°F) or higher
• Altitude (barometric pressure): 2400 m, 8000 ft or less (560 mmHg, 75 kPa or more)
1) With ignition switch turned OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Start engine and warm up to normal operating temperature. (ECT approx. 90 – 95°C, 194 – 203°F)
4) Drive vehicle at 40 km/h (25 mile/h) at 5th gear or D range (engine speed: about 1250 rpm).
5) Increase vehicle speed to 45 km/h (28 mile/h) at 5th gear or D range (engine speed: about 1400 rpm).
6) Release accelerator pedal to decrease vehicle speed till 40 km/h (25 mile/h).
7) Repeat Step 4) to 6) for 5 times.
8) Stop vehicle and check DTC and pending DTC.
TROUBLESHOOTING
Step
1
Was "Engine and Emission Control System Check" per-
formed?
2
Visual inspection.
Check MAF sensor and air intake system for:
1) Objects which block measuring duct and resistor of MAF
sensor.
2) Other air flow which does not pass the MAF sensor.
Are there in good condition?
3
MAF sensor performance check.
1) With ignition switch turned OFF, install scan tool.
2) Start engine and warm up to normal operation tempera-
ture.
3) Check MAF value using scan tool, under the following con-
ditions.
MAF value specification
Idling: 1.5 – 4.0 g/sec.
Racing at 2500 r/min: 5.0 – 10.0 g/sec.
Is each value as specified?
4
MAF sensor output voltage check.
1) Check voltage between "C63-14" and "C63-28" wire termi-
nals under the following conditions.
Voltage between "C63-14" and "C63-28" wire terminals of
ECM connector
Ignition switch ON, leaving engine OFF: 0.5 – 1.2 V
Idling: 1.3 – 1.8 V
Is each value as specified?
Action
Yes
Go to Step 2.
Go to "Engine and
Emission Control
System Check" in
this section.
Go to Step 3.
Repair or replace.
Go to Step 11.
Go to Step 4.
Poor "C63-14" or/
Go to Step 5.
and "C63-28" ter-
minal connection.
If OK, substitute a
known-good ECM
and recheck.
No
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