Engine Controls - Hesitation or Surging Under Load
87nissan2Reference: Date:
TECHNICAL BULLETIN TS87-135 August 24, 1987
Classification: Section: Engine Fuel & Models:
EF&EC87-012 Emission Control Pulsar NX, Sentra, Truck, Pathfinder
INTERMITTENT ENGINE HESITATION/SURGING
APPLIED MODELS: 1986.5-1987 Truck, 1987 Pathfinder, 1987 Van, 1987 Sentra Coupe and 4WD Wagon, 1987 Pulsar NX (XE)
SERVICE INFORMATION
Some of the Applied Models built prior to the VINs listed on page 3/3 of this Technical Bulletin may exhibit intermittent engine hesitation or surging under load. The condition "feels" as if the ignition is shut off for less than a second and then turned back on.
DIAGNOSTIC PROCEDURE
For vehicles that exhibit this sympton, check the engine systems using the driveability diagnostic procedure in the EF & EC section of the appropriate Nissan Service Manual. This will include a complete self-diagnosis procedure at the vehicle ECU and a complete follow LIP with trouble-shooting on any trouble codes, until a code 44 or all clear code is achieved.
NOTE: If a code 11 (crank angle sensor) occurs in a vehicle with manual transmission, clear the memory and repeat the self-diagnosis check. In some vehicles, the code 11 will appear in the self-diagnosis memory any time the ignition switch is turned to the "Start" position while the clutch pedal is not fully depressed.
If the intermittent condition persists after all engine systems are in proper working order according to the tests above, then perform the following test procedure.
TEST PROCEDURE
1. Depress and release the accelerator pedal several times prior to performing steps.
2. Connect an ohmmeter at the throttle sensor connector with the positive + side to pin "d" (terminal side with connector disconnected) and the negative
- side to the throttle sensor base plate as follows:
3. Resistance should be infinity. Move the positive side to pins "e" and "f". Resistance should remain at infinity.
4. If the resistance is anything other than infinity, repeat steps 2 and 3.
5. If the resistance is still anything other than infinity, replace the throttle sensor with the appropriate part listed below. If the throttle sensor is replaced, be sure to adjust it using the procedures in the appropriate Service Manual.
NOTES: E16i engines: the idle speed must be set with the throttle sensor disconnected before adjusting the throttle switch as described in the Service Manual under Throttle Valve Switch Adjustment. VG30i engines: for slight off-idle hesitation on Truck/Pathfinder models, set the initial timing at exactly 14~.
PARTS INFORMATION
The improved throttle sensor has been installed on production vehicles beginning with the following VINs.
APPLIED VINs:
MODEL APPLIED VIN APPLIED DATE
1987 Sentra Coupe JN1PB24S( )HU055198 May 22, 1987
1987 Sentra Wagon 4WD JN1PB25Y( )HU003516 June 1, 1987
1987 Van (A/T) JN8SC26S( )H4004408 November 11, 1987
1987 Van (M/T) JN8SC26S( )H4005184 November 20, 1986
1987 Pulsar NX (XE) JN1PN34S( )HM037700 May 29, 1987
U.S.A. Produced Trucks:
^ with Z24 engines 1N6ND11S( )HC321026 January 5, 1987
^ with VG30 engines 1N6HD16Y( )HC321363 January 5, 1987
Japan Produced Trucks:
^ Z24/2WD/Reg. Bed/(M/T) JN6ND11S( )HW013760 November 6, 1986
^ Z24/2WD/Reg. Bed/(A/T) JN6ND11S( )HW016181 November 16, 1986
^ Z24/2WD/Long Bed/(M/T) JN6ND12S( )HW000775 November 6, 1986
^ Z24/2WD/Reg. Bed/(A/T) JN6NDI2S( )HW000799 November 16, 1986
^ Z24/2WD/King Cab/(M/T) JN6ND16S( )HW007953 November 6, 1986
^ Z24/2WD/Reg. Bed/(A/T) JN6ND16S( )HW008481 November 16, 1986
^ VG30/2WD/Reg. Bed/(A/T) JN6HD11S( )HW000276 December 25, 1986
^ VG30/2WD/Reg. Bed/(M/T) JN6HD11S( )HW000286 January 10, 1987
^ VG30/2WD/King Cab/(A/T) JN6HD16S( )HW003050 December 25, 1986
^ VG30/2WD/King Cab/(M/T) JN6HD16S( )HW003064 January 10, 1987
^ VG30/Long Bed/H.D./(A/T) JN6HD12S( )HW000288 December 25, 1986
^ VG30/Long Bed/H.D./(M/T) JN6HD12S( )HW000322 January 10, 1987
^ VG30/Cab & Chassis/(A/T) JN6HD15S( )HW000248 December 25, 1986
^ VG30/Cab & Chassis/(M/T) JN6HD15S( )HW000269 January 10, 1987
^ Z24/4WD/Reg. Bed JN6ND11Y( )HW001972 November 16, 1986
^ Z24/4WD/Long Bed JN6ND12Y( )HW000227 November 16, 1986
^ Z24/4WD/King Cab JN6ND16Y( )HW001918 November 16, 1986
^ VG30/4WD/Reg. Bed/(A/T) JN6HD11Y( )HW000491 December 25, 1986
^ VG30/4WD/Reg. Bed/(M/T) JN6HD11Y( )HW000501 January 10, 1987
^ VG30/4WD/King Cab/(A/T) JN6HD16Y( )HW004256 December 25, 1986
^ VG30/4WD/King Cab/(M/T) JN6HD16Y( )HW004271 January 10, 1987
1987 Pathfinder:
^ Z24/(M/T) JN6ND14Y( )HW000615 November 6, 1986
^ Z24/(A/T) JN6ND14Y( )HW001093 November 16, 1986
^ VG30/XE/(A/T) JN8HD14Y( )HW001507 December 25, 1986
^ VG30/XE/(M/T) JN8HD14Y( )HW001669 January 10, 1987
^ VG30/SE/(A/T) JN8HD16Y( )HW012242 December 25, 1986
^ VG30/SE/(M/T) JN8HD16Y( )HW012730 January 10, 1987