Suzuki 2000 Grand Vitara SQ416, Service Manual

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YH4
GRAND
VITARA
ENGINE DIAGNOSIS (G16 / J20 ENGINES) 6-95
TROUBLESHOOTING (DTC P1408)
STEP ACTION YES NO
1 Was “ENGINE DIAG. FLOW TABLE” performed? Go to Step 2. Go to “ENGINE
DIAG. FLOW
TABLE”.
2 MAP Sensor Signal Check:
1) Remove ECM (PCM) cover.
2) Check voltage between C51-3-8 and C51-3-22
under following conditions.
With ignition switch ON leaving engine OFF:
0.2 V or higher
At idling: 4.6 V or lower
Is check result as specified?
Intermittent trouble
or faulty ECM
(PCM).
Check for intermit-
tent referring to
“Intermittent and
Poor Connection”
in Section 0A. Go to Step 3.
3 MAP Sensor Check:
1) Disconnect connector from MAP sensor.
2) Check for proper connection to MAP sensor at each
terminal.
3) If OK, check MAP sensor for performance referring to
“MAP Sensor Inspection” in Section 6E1.
Is check result satisfactory?
“R / W”, “Bl / R” or
“W / R” circuit open /
short.
If wire and connec-
tions are OK, substi-
tute a known-good
ECM (PCM) and
recheck. Replace MAP
sensor.