1A-83 Engine General Information and Diagnosis:
3
MAP sensor power supply voltage check
1) Disconnect connector from MAP sensor with ignition
switch turned OFF.
2) Check for proper connection of MAP sensor at “GRY/
RED”, “RED/WHT” and “GRY/GRN” wire terminals.
3) Turn ON ignition switch, measure voltage between
engine ground and “GRY/RED” wire terminal of MAP
sensor connector.
Is voltage 4 – 6 V?
Go to Step 4.
“GRY/RED” wire
shorted to power circuit.
4
MAP sensor ground circuit check
1) Measure resistance between “GRY/GRN” wire terminal
of MAP sensor connector and engine ground with
ignition switch turned OFF.
Is resistance below 3
Ω
?
Go to Step 6.
Go to Step 5.
5
Ground circuit check
1) Measure resistance between “C37-57” terminal of ECM
connector and vehicle body ground.
Is resistance below 3
Ω
?
“GRY/GRN” wire is
open or high resistance
circuit.
ECM grounds “C37-58”,
“C37-48”, “C37-30”,
“C37-29” and/or “C37-
15” circuit are open or
high resistance.
If wires are OK,
substitute a known-
good ECM and recheck.
6
MAP sensor signal circuit check
1) Turn ON ignition switch.
2) Measure voltage between “RED/WHT” wire terminal of
MAP sensor connector and engine ground.
Is voltage 4 – 6 V?
Go to Step 8.
Go to Step 7.
7
MAP sensor signal circuit check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Measure resistance between “RED/WHT” wire terminal
of MAP sensor connector and “C37-55” terminal of ECM
connector.
Is resistance below 2
Ω
?
“RED/WHT” wire is
shorted to power supply
circuit.
“RED/WHT” wire is
open or high resistance
circuit.
8
MAP sensor output signal check
1) Check MAP sensor according to “Manifold Absolute
Pressure (MAP) Sensor Inspection: in Section 1C”.
Is it in good condition?
Substitute a known-
good ECM and recheck.
Faulty MAP sensor.
Step
Action
Yes
No
I5JB0A110035-01
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