1998 ISUZU TROOPER DTC p1589

6E±5 4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
Conditions for Clearing the MIL/DTC 6E±159. . . . .
Diagnostic Aids 6E±159. . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P1562
(Flash DTC 35) System Voltage Too Low
at Cranking 6E±160. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Description 6E±160. . . . . . . . . . . . . . . . . . . . .
Action Taken When the DTC Sets 6E±160. . . . . . .
Conditions for Clearing the MIL/DTC 6E±160. . . . .
Diagnostic Aids 6E±160. . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P1587
(Flash DTC 25) Brake SW Malfunction 6E±161. . . .
Circuit Description 6E±161. . . . . . . . . . . . . . . . . . . . .
Action Taken When the DTC Sets 6E±161. . . . . . .
Conditions for Clearing the MIL/DTC 6E±161. . . . .
Diagnostic Aids 6E±161. . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P1588
(Flash DTC 25) Brake SW Malfunction 6E±163. . . .
Circuit Description 6E±163. . . . . . . . . . . . . . . . . . . . .
Action Taken When the DTC Sets 6E±163. . . . . . .
Conditions for Clearing the MIL/DTC 6E±163. . . . .
Diagnostic Aids 6E±163. . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P0601
(Flash DTC 55) ECM Checksum Error 6E±165. . . . .
Action Taken When the DTC Sets 6E±165. . . . . . .
Conditions for Clearing the MIL/DTC 6E±165. . . . .
Diagnostic Aids 6E±165. . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P0650
(Flash DTC 77) Check Engine Lam Circuit
Open/Short 6E±166. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Description 6E±166. . . . . . . . . . . . . . . . . . . . .
Action Taken When the DTC Sets 6E±166. . . . . . .
Conditions for Clearing the MIL/DTC 6E±166. . . . .
Diagnostic Aids 6E±166. . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P0654
(Flash DTC 27) Tachometer Circuit
Open/Short 6E±168. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Description 6E±168. . . . . . . . . . . . . . . . . . . . .
Action Taken When the DTC Sets 6E±168. . . . . . .
Conditions for Clearing the MIL/DTC 6E±168. . . . .
Diagnostic Aids 6E±168. . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P1655
(Flash DTC 17) Thermo Relay Circuit
Open/Short 6E±170. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Description 6E±170. . . . . . . . . . . . . . . . . . . . .
Action Taken When the DTC Sets 6E±170. . . . . . .
Conditions for Clearing the MIL/DTC 6E±170. . . . .
Diagnostic Aids 6E±170. . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P1657
(Flash DTC 76) ECM Main Relay Circuit
Open/Short 6E±172. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Description 6E±172. . . . . . . . . . . . . . . . . . . . .
Action Taken When the DTC Sets 6E±172. . . . . . .
Conditions for Clearing the MIL/DTC 6E±172. . . . .
Diagnostic Aids 6E±172. . . . . . . . . . . . . . . . . . . . . . . . Diagnostic Trouble Code (DTC) P1589
(Flash DTC 47) Transmission SW Circuit
Open/Short 6E±174. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Description 6E±174. . . . . . . . . . . . . . . . . . . . .
Action Taken When the DTC Sets 6E±174. . . . . . .
Conditions for Clearing the MIL/DTC 6E±174. . . . .
Diagnostic Aids 6E±174. . . . . . . . . . . . . . . . . . . . . . . .
Symptom Diagnosis 6E±176. . . . . . . . . . . . . . . . . . . . .
Default Matrix Table 6E±199. . . . . . . . . . . . . . . . . . . . .
On±Vehicle Service Camshaft Position
(CMP) Sensor 6E±201. . . . . . . . . . . . . . . . . . . . . . . . . .
Removal Procedure 6E±201. . . . . . . . . . . . . . . . . . . .
Inspection Procedure 6E±201. . . . . . . . . . . . . . . . . .
Installation Procedure 6E±201. . . . . . . . . . . . . . . . . .
Crankshaft Position (CKP) Sensor 6E±202. . . . . . . . .
Removal Procedure 6E±202. . . . . . . . . . . . . . . . . . . .
Installation Procedure 6E±202. . . . . . . . . . . . . . . . . .
Engine Coolant Temperature (ECT) Sensor 6E±203.
Removal Procedure 6E±203. . . . . . . . . . . . . . . . . . . .
Installation Procedure 6E±203. . . . . . . . . . . . . . . . . .
Intake Air Temperature (IAT) Sensor 6E±203. . . . . . .
Removal Procedure 6E±203. . . . . . . . . . . . . . . . . . . .
Installation Procedure 6E±204. . . . . . . . . . . . . . . . . .
Manifold Absolute Pressure (MAP) Sensor 6E±204.
Removal Procedure 6E±204. . . . . . . . . . . . . . . . . . . .
Installation Procedure 6E±205. . . . . . . . . . . . . . . . . .
Oil Temperature (OT) Sensor 6E±205. . . . . . . . . . . . .
Removal Procedure 6E±205. . . . . . . . . . . . . . . . . . . .
Installation Procedure 6E±206. . . . . . . . . . . . . . . . . .
Malfunction Indicator Lamp (MIL) 6E±206. . . . . . . . . .
Removal and Installation Procedure 6E±206. . . . . .
Engine Control Module (ECM) 6E±206. . . . . . . . . . . .
Service Precaution 6E±206. . . . . . . . . . . . . . . . . . . .
Electrostatic Discharge (ESD) Damage 6E±206. . .
Removal Procedure 6E±207. . . . . . . . . . . . . . . . . . . .
Installation Procedure 6E±208. . . . . . . . . . . . . . . . . .
EEPROM 6E±208. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Description 6E±208. . . . . . . . . . . . . . . . . . . .
Functional Check 6E±208. . . . . . . . . . . . . . . . . . . . . .
Intake Throttle Position (ITP) Sensor 6E±208. . . . . . .
Removal Procedure 6E±208. . . . . . . . . . . . . . . . . . . .
Function Check 6E±209. . . . . . . . . . . . . . . . . . . . . . .
Installation Procedure 6E±209. . . . . . . . . . . . . . . . . .
Vehicle Speed Sensor (VSS) 6E±210. . . . . . . . . . . . .
Removal Procedure 6E±210. . . . . . . . . . . . . . . . . . . .
Inspection Procedure 6E±210. . . . . . . . . . . . . . . . . .
Installation Procedure 6E±210. . . . . . . . . . . . . . . . . .
Air Cleaner/Air Filter 6E±211. . . . . . . . . . . . . . . . . . . . .
Removal Procedure 6E±211. . . . . . . . . . . . . . . . . . . .
Installation Procedure 6E±211. . . . . . . . . . . . . . . . . .
Accel Position (AP) Sensor 6E±211. . . . . . . . . . . . . . .
Removal Procedure 6E±211. . . . . . . . . . . . . . . . . . . .
Installation Procedure 6E±212. . . . . . . . . . . . . . . . . .
Accelerator Pedal Replacement 6E±212. . . . . . . . . . .

6E±55 4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
DTC
using a
Tech 2Flash DTCDescriptionMIL
P047571EXH #1 VSV Circuit Open/ShortÐ
P147571EXH #2 VSV Circuit Open/ShortÐ
P148574Intake Throttle Position Sensor Low VoltageON
P148674Intake Throttle Position Sensor High VoltageON
P148773Intake Throttle System Circuit Open/ShortON
P148872Intake Throttle Motor Control Circuit Signal GapÐ
P050224Vehicle Speed Sensor No SignalON
P051075Idle SW Malfunction, Open CircuitON
P151075Idle SW Malfunction, Short CircuitON
P056235System Voltage Too LowON
P156235System Voltage Too Low at CrankingON
P158725Brake SW Malfunction [B]Ð
P158825Brake SW Malfunction [A]ON
P060155ECM Checksum ErrorON
P162656Immobilizer No SignalON
P163156Immobilizer Wrong SignalON
P164856No Security Code EnteredON
P164956Immobilizer Function not ProgrammedON
P065077Check Engine Lamp Circuit Open/ShortÐ
P065427Techometer Circuit Open/ShortÐ
P165517Thermo Relay Circuit Open/ShortÐ
P165776ECM Main Relay Circuit Open/ShortÐ
P158947TransMission SW Circuit Open/ShortÐ

6E±174
4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P1589 (Flash DTC 47)
Transmission SW Circuit Open/Short
060RW131
Circuit Description
The trans mission SW circuit receives current through
ELEC IG 10A fuse from the battery, current flowing in the
order of the trans mission SW and ECM.
Action Taken When the DTC Sets

The ECM will illuminate the malfunction indicator lamp
(MIL) the first time the fault is detected.

The ECM 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

DTC P1589 can be cleared by using the Tech 2 ªClear
Infoº function or by disconnecting the ECM battery
feed.
Diagnostic Aids
Check for the following conditions:

Poor connection at ECM ± Inspect harness connectors
for backed-out terminals, improper mating, broken
locks, improperly formed or damaged terminals, and
poor terminal-to-wire connection.

Damaged harness ± Inspect the wiring harness for
damage. If the harness appears to be OK, observe the
throttle position display on the Tech 2 while moving
connectors and wiring harnesses related to the TP
sensor. A change in the display will indicate the
location of the fault.
If DTC P1589 cannot be duplicated, the information
included in the Failure Records data can be useful in
determining vehicle mileage since the DTC was last set.
DTC P1589 ± Transmission Circuit Open/Short

StepActionValue(s)Ye sNo
1Was the ªOn-Board Diagnostic (OBD) System Checkº
performed?
ÐGo to Step 2
Go to OBD
System
Check
2Check the Fuse 10A for a open circuit and replace the
Fuse if necessary.
Did the Fuse require replacement?
ÐVerify repairGo to Step 3

6E±175 4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
DTC P1589 ± Transmission Circuit Open/Short

 
StepNo Ye s Value(s) Action
31. Ignition ªON,º engine ªOFF.º
2. Review and record Tech 2 Failure Records data.
3. Operate the vehicle within Failure Records
conditions as noted.
4. Using a Tech 2, monitor the ªDTCº info for DTC
P1589.
Does the Tech 2 indicate DTC P1589 failed?
Ð
Go toStep 4
(A/T)
Go toStep 6
(M/T)
Refer to
Diagnostic
Aids
4Check the Indicator Lamp correct indicated for a
correct indication on the Meter. (A/T only)
Did the Indicator Lamp correct indicated?
ÐGo to Step 5Go to Step 8
5Check the Trans Mission SW signal circuit for a poor
connection at the ECM and replace the terminal if
necessary.
Did the terminal require replacement?
ÐVerify repairGo to Step 8
6Check the Trans Mission SW circuit for a poor
connection at the Trans Mission SW and replace the
terminal if necessary.
Did the terminal require replacement?
ÐVerify repairGo to Step 7
7Replace the Trans Mission SW.
Is the action complete?
ÐVerify repairGo to Step 8
8Replace the ECM (Refer to the Data Programming in
Case of ECM change).
Is the action complete?
ÐVerify repairÐ