2004 ISUZU TF SERIES Workshop Manual

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Page 2217 of 4264

ISUZU TF SERIES 2004 Workshop Manual 3.5L ENGINE DRIVEABILITY AND EMISSIONS 6E-221
DIAGNOSTIC TROUBLE CODE (DTC) P1171 (FLASH CODE 44) FUEL SUPPLY
SYSTEM LEAN DURING POWER ENRICHMENT (Bank 1)
DIAGNOSTIC TROUBLE CODE (DTC) P1172 (FLASH

Page 2218 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6E-222 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Condition For Setting The DTC and Action Taken When The DTC Sets
Flash
Code Code Type DTC Name DTC Setting Condition Fail-Safe (Back Up)
P1171 D F

6E-222 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Condition For Setting The DTC and Action Taken When The DTC Sets
Flash
Code Code Type DTC Name DTC Setting Condition Fail-Safe (Back Up)
P1171 D Fuel Supply System
Lean During Power
Enrichment (Bank 1) 44

P1172 D Fuel Supply System
Lean During Power
Enrichment (Bank 2) 1. No DTC relating to MAF sensor, IAT sensor, ECT sensor,
TPS, CMP sensor, CKP sensor, VSS, injector control
circuit, ignition control circuit, O2 sensor circuit low voltage
& high voltage (bank 1 & 2) and O2 sensor circuit no
activity (bank 1 & 2).
2. Engine speed is between 1000rpm and 6000rpm.
3. Intake air temperature is below 70C.
4. Engine coolant temperature is between 30C and 120C.
5. Engine load is between 150 and 255.
6. Throttle position output is more than 2.22V and fluctuation
is below 0.28V.
7. Except fuel cut operation.
8. O2 sensor output voltage below 250mV for 10 seconds. No fail-safe function.

CIRCUIT DESCRIPTION
The engine control module (ECM) internal circuitry can
identify if the vehicle fuel system is capable of supplying
adequate amounts of fuel during heavy acceleration
(power enrichment). The ECM monitors the voltage o
f
the oxygen sensor during power enrichment. When a
power enrichment mode of operation is requested
during “closed loop" operation (by heavy acceleration),
the ECM will provide more fuel to the engine. Unde
r
these conditions the ECM should detect a “rich"
condition (high oxygen sensor voltage). If this “rich"
exhaust is not detected at this time, a DTC P1171 o
r
P1172 will set. A plugged fuel filter, restricted fuel line,
restricted in-tank filter or defective fuel pump can
prevent adequate amouts of fuel from being supplied
during power enrichment mode.

DIAGNOSTIC AIDS
A restricted fuel filter or fuel line, restricted in-tank
filter, or a defective fuel pomp may supply adequate
amounts of fuel at idle, but may not be able to supply
enough fuel during heavy acceleration.
Water or alcohol in the fuel may cause low HO2S
voltage during acceleration.
Check for faulty or plugged fuel injector(s).
Check for low fuel.

Page 2219 of 4264

ISUZU TF SERIES 2004 Workshop Manual 3.5L ENGINE DRIVEABILITY AND EMISSIONS 6E-223
Diagnostic Trouble Code (DTC) P1171 (Flash Code 44) Fuel Supply System
Lean During Power Enrichment (Bank 1)
Diagnostic Trouble Code (DTC) P1172 (Flash

Page 2220 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6E-224 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Step Action Value (s) Yes No
6
1. Using the Tech 2, ignition "On" and engine "Off".
2. Monitor the "Throttle Position" in the data display.

6E-224 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Step Action Value (s) Yes No
6
1. Using the Tech 2, ignition "On" and engine "Off".
2. Monitor the "Throttle Position" in the data display.
Does the Tech 2 indicate correct "Throttle Position"
from 0% to 100% depending on accelerator pedal
operation?
- Go to Step 8 Go to Step 7
7
1. Using the Tech 2, ignition "On" and engine "Off".
2. Monitor the "Throttle Position" in the data display.
3. Adjust the TPS within 0% to 100%.
Is the action complete?
- Verify repair -
8
Check for the following conditions.
Objects blocking the throttle valve.
Vacuum leaking at throttle body.
If a problem is found, repair as necessary.
Was the problem found?
- Verify repair Refer to DTC
P0121 and Go to
Step 9
9
1. Using the Tech 2, ignition "On" and engine "On".
2. Select the "Miscellaneous Test" and perform the
"IAC Control" in the "IAC System".
3. Operate the Tech 2 in accrodance with procedure.
Was the engine speed changed, when the IAC Valve
is operating step by step?
-
Go to Step 10
Go to Step 10
10
Check for the following conditions.
Objects blocking the IAC Valve.
Objects blocking the throttle valve.
Vacuum leaking at throttle body.
If a problem is found, repair as necessary.
Was the problem found?
- Verify repair Refer to DTC
P1508/P1509
and Go to Step
11
11
Check for injector for the affected bank.
Refer to 6E-106 "Injector Coil Test & Injector Balance
Test Procedure".
Was the injector operation correct?
- Go to Step 12 Refer to Injector
Coil Test &
Injector Balance
Test Procedure
12
Check for fuel pressure.
Refer to 6E-116 "Fuel System Diagnosis".
Was the fuel pressure correct?
- Go to Step 13 Refer to Fuel
System
Diagnosis
13
Replace the O2 sensor for the affected bank.
Was the problem solved?
- Verify repair Go to Step 14
14
Is the ECM programmed with the latest software
release?
If not, download the latest software to the ECM using
the "SPS (Service Programming System)".
Was the problem solved?
- Verify repair Go to Step 15

Page 2221 of 4264

ISUZU TF SERIES 2004 Workshop Manual 3.5L ENGINE DRIVEABILITY AND EMISSIONS 6E-225
Step Action Value (s) Yes No
15
Replace the ECM.
Is the action complete?
IMPORTANT: The replacement ECM must be
programmed. Refer to section of

Page 2222 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6E-226 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DIAGNOSTIC TROUBLE CODE (DTC) P0201 (FLASH CODE 31) INJECTOR 1
CONTROL CIRCUIT
DIAGNOSTIC TROUBLE CODE (DTC) P0202 (FLASH CODE 31) INJECTOR 2
CONTR

Page 2223 of 4264

ISUZU TF SERIES 2004 Workshop Manual 3.5L ENGINE DRIVEABILITY AND EMISSIONS 6E-227
Condition For Setting The DTC and Action Taken When The DTC Sets
Flash
Code Code Type DTC Name DTC Setting Condition Fail-Safe (Back Up)
P0201 A

Page 2224 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6E-228 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0201 (Flash Code 31) Injector 1
Control Circuit
Diagnostic Trouble Code (DTC) P0202 (Flash Code 31) Injector 2
Contr

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