Mitsubishi Colt Ralliart. Manual - part 726
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-229
Code No. P2138: Accelerator Pedal Position Sensor (Main and Sub) Range/Performance Problem
OPERATION
• Refer to Code No. P2122: Accelerator Pedal
Position Sensor (main) Circuit Low Input
.
• Refer to Code No. P2127: Accelerator Pedal
Position Sensor (sub) Circuit Low Input
.
FUNCTION
• Engine-ECU checks the accelerator pedal posi-
tion sensor output signal characteristics for
abnormal conditions.
TROUBLE JUDGMENT
Check Conditions
• Ignition switch is in "ON" position.
• Not while engine is being cranked.
• Battery voltage is more than 6.3 V.
• Accelerator pedal position sensor (main) output
voltage is more than 0.2 V and is less than 4.8 V.
• Accelerator pedal position sensor (sub) output
voltage is more than 0.2 V and is less than 2.5 V.
Judgement Criterion
• When variation in accelerator openinging angle is
small.
• Difference is more than 0.3 V between accelera-
tor pedal position sensor (sub) output voltage
multiplied by 2 and accelerator pedal position
sensor (main) output voltage.
PROBABLE CAUSE
• Failed accelerator pedal position sensor
• Open/short circuit in accelerator pedal position
sensor circuit or loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Connector check: B-26 accelerator pedal
position connector
Q: Is the check result normal?
YES :
Go to Step 2 .
NO :
Repair or replace.
STEP 2. Perform resistance measurement at B-26
accelerator pedal position sensor connector.
• Disconnect connector, and measure at harness
side.
• Resistance between terminal No. 2 and earth.
OK: Continuity (2
Ω or less)
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Go to Step 3 .
AK402092
1
6 5 4 3 2
B-26(B)
AC
Connector: B-26
Harness side
connector
AK402092
1
6 5 4 3 2
B-26(B)
AC
Connector: B-26
Harness side
connector
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