Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual - part 1291

6E1–240

RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

Reviewing the Failure Records vehicle mileage since the
diagnostic test last failed may help determine how often

the condition that caused the DTC to be set occurs. This
may assist in diagnosing the condition.

DTC P0352  Ignition Coil ”B” Primary/Secondary Circuit Malfunction

 

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

Check for a faulty connection or damaged terminals at
the ignition control module.

Was a problem found?

—

Verify Repair

Go to Step 3 

3

Check for a faulty connection or damaged terminals at
the PCM connector.

Was a problem found?

—

Verify Repair

Go to Step 4 

4

1. Ignition OFF.
2. Disconnect the PCM and the ignition control

module.

3. Check the ignition control circuit for a short to

voltage.

Was a problem found?

—

Verify Repair

Go to Step 5 

5

Check the ignition control circuit for a short to voltage.

Was a problem found?

—

Verify Repair

Go to Step 6 

6

Check for an open in the ignition control circuit.

Was a problem found?

—

Verify Repair

Go to Step 7 

7

Replace the ignition control module.
Verify repair.

Is there still a problem?

—

Go to Step 8 

—

8

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 repair complete?

—

Verify Repair

—

6E1–241

RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

DIAGNOSTIC TROUBLE CODE (DTC) P0401 EXHAUST GAS RECIRCULATION

(EGR) FLOW INSUFFICIENT DETECTED

060R100039

Circuit Description

The powertrain control module (PCM) tests the exhaust
gas recirculation (EGR) system during deceleration by
momentarily commanding the EGR valve to open while
monitoring the manifold absolute pressure (MAP) sensor
signal. When the EGR valve is opened, the PCM monitors
the change in MAP input signal. The PCM compares the
MAP change to a RPM vs. BARO table. When the PCM
interprets the change in MAP to be out of limits, the PCM
will set DTC P0401. The number of test samples required
to accomplish this may vary according to the severity of
the detected flow error.
Normally, the PCM will only allow one EGR flow test
sample to be taken during an ignition cycle. To aid in
verifying a repair, the PCM allows twelve test samples
during the first ignition cycle following a Tech 2 ”Clear Info”
or a battery disconnect. Between nine and twelve
samples should be sufficient for the PCM to determine
adequate EGR flow and pass the EGR test.  DTC P0401
is a type A code.

Conditions for Setting the DTC

D

No TP sensor, VSS, EVAP Purge, IAC, IAT sensor,
MAP sensor, EGR Pintle Position sensor, ECT sensor,
Excessive EGR DTCs set.

D

Barometric pressure is above 72 kPa.

D

Engine coolant temperature is greater than 24

°

C

(165

°

F).

D

System voltage is between 11.5 and 16 volts.

D

Vehicle speed is greater than 29 km/h (18 mph).

D

IAC position is steady, changing less than 5 counts.

D

A/C clutch status is unchanged.

Start Test

D

TP angle is less than 0.8%.

D

EGR duty cycle is less than 2%.

D

MAP is steady, changing less than 1 kPa.

D

Engine speed is between 1400 RPM and 2800 RPM.

D

Compensated MAP between 10.3 kPa and 49.8 kPa.

Run Test

D

Delta MAP is recorded during valve open conditions.

D

EGR valve is ramped over a time interval.

Run Test will be aborted if any of the following are true:

D

Vehicle speed changes by greater than 6 km/h (4mph).

D

Engine RPM changes by greater than 50 rpm.

D

EGR is opened less than 95% of the commanded
amount.

During the Start Test and the Run Test, the EGR is closed
then opened.  The associated change in MAP is
compared with the PCM’s expected change value.  If the

6E1–242

RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

difference between the two values exceeds the PCM’s
internal limit, a Diagnostic Trouble Code P0401 will set.
DTC P0401 is a type A code.

NOTE: Several deceleration cycles will be necessary to
run a sufficient number of EGR flow tests to determine a
”pass” or ”fail” condition.

Action Taken When the DTC Sets

D

The Malfunction Indicator Lamp (MIL) will illuminate
the first time the fault is detected.

D

A history Diagnostic Trouble Code is stored.

D

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

D

The MIL will turn OFF after three consecutive ignition
cycles in which the diagnostic runs without a fault.

Conditions for Clearing the DTC

D

The MIL will turn OFF after three consecutive ignition
cycles in which the diagnostic runs without a fault.

D

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

D

Diagnostic Trouble Codes can be cleared by using the
Tech 2.

Diagnostic Aids

Check for the following conditions:

D

Poor connection or damaged harness – Inspect the
wiring harness for damage. If the harness appears to
be OK, observe the Actual EGR Position display on the
Tech 2 while moving connectors and wiring harnesses
related to the EGR valve. A change in the display will
indicate the location of the fault.

D

Ensure EGR valve is correctly mounted. See
On–Vehicle Service.

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.

NOTE: If the EGR valve shows signs of excessive heat,
check the exhaust system for blockage (possibly a
plugged catalytic converter) using the ”Restricted
Exhaust System Check.”

6E1–243

RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

DTC P0401 – Exhaust Gas Recirculation Flow Insufficient Detected

 

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

1. Start the engine.
2. Monitor the MAP signal with a Tech 2 while idling.
3. While idling, depress the accelerator pedal about

halfway down and immediately let the engine return
to idle.

Did the MAP value on the Tech 2 show an immediate
large change?

—

Go to Step  4 

Go to Step  3 

3

Replace the MAP sensor.

—

Verify repair

—

4

1. Inspect the exhaust system for modification of

original installed parts or leaks.

2. If a problem was found, repair exhaust system as

necessary.

Was a condition present that required repair?

—

Go to Step  7 

Go to Step  5 

5

1. Remove the EGR valve.
2. Visually and physically inspect the pintle, valve

passages and the adapter for excessive deposits or
any kind of a restriction.

3. If a problem if found, clean or replace EGR system

components as necessary.

Was a condition present that required repair?

—

Go to Step  7 

Go to Step  6 

6

1. Remove the EGR inlet and outlet pipes from the

exhaust manifold and the intake manifold.

2. Inspect the manifold EGR ports and the EGR inlet

and outlet pipes for a blockage caused by excessive
deposits or other damage.

3. If a problem is found, correct the condition as

necessary.

Was a condition present that required repair?

—

Go to Step  7 

Refer to

Diagnostic

Aids 

7

1. Review and record the Tech 2 Failure Records data.
2. Clear Diagnostic Trouble Code and monitor the

Tech 2 System Info Screen while operating the
vehicle as specified in ”Diagnostic Aids.”

3. Using a Tech 2, monitor “Diagnostic Trouble Code”

info for Diagnostic Trouble Code P0401 until the
Diagnostic Trouble Code P0401 test runs.

4. Note the test result.

Does the Tech 2 indicate Diagnostic Trouble Code
P0401 failed this ignition?

—

—

Repair

complete