Isuzu Rodeo UE. Manual - part 229

6E1–287

RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

DIAGNOSTIC TROUBLE CODE (DTC) P0507 IDLE CONTROL SYSTEM RPM

HIGHER THAN EXPECTED 

D06RX041

Circuit Description

The powertrain control module (PCM) controls engine
idle speed by adjusting the position of the idle air control
(IAC) motor pintle. The IAC is a bi–directional stepper
motor driven by two coils. The PCM applies current to the
IAC coils in steps (counts) to extend the IAC pintle into a
passage in the throttle body to decrease air flow. The
PCM reverses the current to retract the pintle, increasing
air flow. This method allows highly accurate control of idle
speed and quick response to changes in engine load. If
the PCM detects a condition where too high of an idle
speed is present and the PCM is unable to adjust idle
speed by increasing the IAC counts, Diagnostic Trouble
Code P0507 will set, indicating a problem with the idle
control system.   DTC P0507 is a type B code.

Conditions for Setting the DTC

f

No intrusive tests being run.

f

Engine run time is more than 125 seconds.

f

No TPS, VSS, ECT, EGR, MAP, IAT, misfire, low
voltage, fuel system or canister purge DTCs are set.

f

Barometric pressure is greater than 72.7 kPa.

f

Canister purge duty cycle is above 0%.

f

Intake air temperature above –40

°

C (–40

°

F).

f

Engine coolant temperature (ECT) is above 50

°

C

(122

°

F).

f

Ignition voltage is between 9.5 volts and 16 volts.

f

The throttle is closed.

f

All conditions are met for 10 seconds.

f

MAP is less than 60 kPa.

f

Engine speed is at least 200 RPM lower than desired
idle, based upon PCM’s expectations.

Action Taken When the DTC Sets

f

The PCM will illuminate the malfunction indicator lamp
(MIL) after the second consecutive trip in which the
fault is detected.

f

The PCM will store conditions which were present
when the DTC was set as Freeze Frame and in the
Failure Records data.

Conditions for Clearing the MIL/DTC

f

The PCM will turn the MIL OFF on the third consecutive
trip cycle during which the diagnostic has been run and
the fault condition is no longer present.

f

A history Diagnostic Trouble Code P0507 will clear
after 40 consecutive warm–up cycles have occurred
without a fault.

f

Diagnostic Trouble Code P0507 can be cleared by
using the Scan Tool’s ”Clear Info” function.

Diagnostic Aids

Check for the following conditions:

f

Poor connection at PCM or IAC motor – Inspect
harness connectors for backed–out terminals,

6E1–288

RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

improper mating, broken locks, improperly formed or
damaged terminals, and poor terminal–to–wire
connection.

f

Damaged harness – Inspect the wiring harness for
damage; shorts to ground, shorts to battery positive,
and open circuits.

f

Vacuum leak – Check for a condition that causes a
vacuum leak, such as disconnected or damaged
hoses, leaks at EGR valve and EGR pipe to intake
manifold, leak at the throttle body, a faulty or incorrectly
installed PCV valve, leaks at the intake manifold, etc.

f

Throttle body – Check for sticking throttle plate. Also
inspect the IAC passage for deposits or objects which
will not allow the IAC pintle to fully extend or properly
seat.

If Diagnostic Trouble Code P0507 cannot be duplicated,
reviewing the Failure Records vehicle mileage since the
diagnostic test last failed may help determine how often
the condition that caused the Diagnostic Trouble Code to
be set occurs. This may assist in diagnosing the
condition.

DTC P0507 – Idle Control System RPM Higher Than Expected

 

Step

Action

Value(s)

Yes

No

1

Was the ”On–Board Diagnostic (OBD) System Check”
performed?

—

Go to Step  2 

Go to OBD

System

Check 

2

Are any other Diagnostic Trouble Codes set?

—

Go to other

Diagnostic

Trouble Code

first

Go to Step  3 

3

1. Start the engine.
2. Turn all accessories OFF (A/C, rear defroster, etc.)
3. Using a Tech 2, command RPM up to 1500, down to

500, and then up to 1500 while monitoring ”Engine
Speed” on the Tech 2.

Does the ”Engine Speed” remain within the specified
value of ”Desired Idle” for each RPM command?

+/–50 RPM

No trouble

found. Go to

Diagnostic

Aids 

Go to Step  4 

4

1. Disconnect the IAC.
2. Install IAC Noid Light J 37027A or equivalent.
3. With the engine running, command RPM up to

1500, down to 500, and then up to 1500 while
observing the noid light.

Does each noid light cycle red and green (never OFF)?

—

Go to Step  6 

Go to Step  5 

5

1. Check the following circuits for an open, short to

voltage, short to ground, or poor connection at the
PCM:

f

IAC ”A” low

f

IAC ”A” high

f

IAC ”B” low

f

IAC ”B” high

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to Step  9 

6

Visually/physically inspect for the following conditions:

f

Vacuum leaks

f

Throttle body tampering (adjustment screw plug
removed).

f

Throttle plate or throttle shaft for binding.

f

Accelerator and cruise control cables for being
mis–adjusted or for binding.

f

Faulty, missing, or incorrectly installed PCV
valve.

Do any of the above require a repair?

—

Refer to

appropriate

section for

on–vehicle

service

Go to Step  7 

6E1–289

RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

DTC P0507 – Idle Control System RPM Higher Than Expected

  (Cont'd)

Step

No

Yes

Value(s)

Action

7

1. Check for a poor connection at the IAC harness

connector.

2. If a problem is found, replace faulty terminals as

necessary.

Was a problem found?

—

Verify repair

Go to Step  8 

8

Using a Digital Voltmeter (DVM), check the IAC valve
solenoids (A and B) for the following conditions:

f

An open circuit

f

A short to ground (the IAC body)

f

A short together

Was the problem found?

—

Go to Step 9 

Go to Step 10

9

Replace the IAC valve.

Is the action complete?

—

Verify repair

—

10

Replace the PCM.

IMPORTANT: The replacement PCM must be
programmed. Refer to On–Vehicle Service in
Powertrain Control Module and Sensors for
procedures. 

And also refer to latest Service Bulletin.
Check to see if the Latest software is released or not.
And then Down Load the LATEST PROGRAMMED
SOFTWARE to the replacement PCM.

Is the action complete?

—

Verify repair

—

6E1–290

RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

DIAGNOSTIC TROUBLE CODE (DTC) P0532 A/C REFRIGERANT PRESSURE

SENSOR CIRCUIT LOW INPUT

D06RX060

Circuit Description

The Powertrain Control Module (PCM) monitors the A/C
refigerant pressure through the use of a three wire
sensor.  If the PCM senses the pressure falls below a
threshold value, then DTC P0532 will set.  DTC P0532 is a
type D code.

Conditions for Setting the DTC

f

A/C pressure sensor is below 5 counts (0.1 volt) for 125
seconds within a 250 seconds test sample.

Action Taken When the DTC Sets

f

The PCM will not illuminate the Malfunction Indicator
Lamp (MIL).

f

The PCM will store the conditions that were present
when the DTC was set as Freeze Frame and in Failure
Records.

Conditions for Clearing the DTC

f

A History DTC will clear after 40 consecutive trips
without a reported failure.

f

The DTC can be cleared using a Scan Tool’s ”Clear
Info” function.

Diagnostic Aids

Poor Conditions, or a damaged harness – Inspect the
harness connectors for: backed–out terminals, improper
mating or damaged terminals.  Also, check for open
circuits, shorts to ground, and shorts to voltage.