Modification Of Fuel Pump Operating Condition By ECM (TS 4-21 11016(R))
Publication date: 1996-11-01Reference number: TS 4-21 11016(R)
Supersedes refnos: TS 4-21 04196
MODIFICATION OF FUEL PUMP OPERATING CONDITION BY ECM
TECHNICAL SERVICE BULLETIN
Superceded Bulletin(s): TS 4-21 04196, Date of Issue: April 19, 1996
MODIFICATION OF FUEL PUMP OPERATING CONDITION AND TPS VOLTAGE BY THE ECM
Model(s): 1995 Production & Later Suzuki Sidekick Sport
Section Title: Engine
Bulletin No.: TS 4-21 11016(R)
Date: November 1, 1996
CONDITION
- Incorrect TPS output value when using Tech-1.
- Change in fuel pump operation logic.
- Modification of ECM.
CAUSE
N/A.
CORRECTION
When replacing diagnostics and adjustments on the TPS and fuel pump, please use the information listed in this bulletin.
REVISION
- Change in TPS output voltage display when using Tech-1.
- Change in operation logic of fuel pump when the ignition switch is in the "ON" position.
SERVICE INFORMATION
This bulletin is to inform you of the modification to the ECM (Engine Control Module) which has been carried out since November, 1995 production. There have been two revisions to the ECM: LATE style A1 and LATE style type B1.
Two modifications have been incorporated into the most current (B1) LATE style ECM. The modifications incorporated into the B1 type LATE style ECM include:
- Change to ECM to allow correct display of TPS voltage when using Tech-1.
- Change to fuel pump operation logic to enable fuel pump operation for 3 seconds after the ignition is turned to the "ON" position.
One modification has been incorporated into the A1 type LATE style ECM. This modification includes:
- Change to ECM to allow correct display of TPS voltage when using Tech-1.
To determine which modifications have been incorporated into the ECM in your vehicle please note the stating VIN numbers listed below for each modification and follow the necessary diagnostic procedures as listed in this bulletin.
VIN NUMBERS
Effective starting VIN with updated parts.
Modification of fuel pump operating condition: JS3TD21V_T4105124
Modification of TP Sensor Output Voltage: JS3TD21V_T4104670 W/ M/T
JS3TD21V_T4104203 W/ A/T
EARLY/LATE TYPE IDENTIFICATION
Both the EARLY and LATE type ECM can be identified by the ECM Name Plate affixed to the face of the ECM. See Fig 1 .
| Part Name | EARLY Type ECM Plate No. | LATE Type ECM Plate No. | Qty. |
|---|---|---|---|
| ECM | 33920-77E40 | 33920-77E41 | 1 |
| ECM | 33920-77E5O | 33920-77E51 | 1 |
|
NOTE:
LATE style ECM has A1 and B1 mark. Final ECM has B1 mark.
|
|||
FUEL PUMP OPERATION
Depending on the type of ECM installed in the vehicle, fuel pump operation will vary. Please note the differences between the various types listed below:
EARLY TYPE AND A1 STYLE LATE TYPE
The ECM will activate the fuel pump when it receives a signal from:
- The engine starter circuit.
- The CMP (Camshaft Position) sensor.
B1 STYLE LATE TYPE
The ECM will activate the fuel pump when it receives a signal from:
- The engine starter circuit.
- The CMP (camshaft position) sensor.
- The ignition switch "ON" position. (The fuel pump will operate for 3 seconds when the ignition switch is initially turned on to the "ON" position.)
SERVICING OF THE THROTTLE POSITION SENSOR
The TPS on vehicles equipped with the EARLY style ECM should not be adjusted using the Tech-1 indication. On vehicles equipped with these ECM's, the Tech-1 will erroneously display a TPS voltage approximately 0.5 volts lower than the actual voltage output from the TPS. To check and/or adjust the TPS on these vehicles, use a digital voltmeter. Refer to the 1996 Sidekick Supplementary Service Manual (99501-61A20-33E) for the adjustment procedure. Vehicles equipped with the B1 style LATE style ECM display the correct TPS voltage with the Tech-1 voltage with the Tech-1 and may be serviced in the normal manner.