Rough Idle/Stall After Cold Start - Control Module (CAT. F, NO. 008/95)

ROUGH IDLE/STALL AFTER COLD START - CONTROL MODULE

TECHNICAL SERVICE BULLETIN

ROUGH IDLE/STALL AFTER COLD START

Model(s): 1994 Mazda B-3000 with A/T

Category: F - Fuel & Emissions

Bulletin No.: 008/95

Date: 6/16/95

APPLICABLE MODELS

All 1994 B3000 model vehicles with an automatic transmission.

DESCRIPTION

Rough idle and/or stalling may occur during the first minute after the initial cold start in ambient temperatures of 50-70° F (10-20° C). This occurs from poor fuel quality (low volatility).

To correct this concern, a countermeasure Powertrain Control Module (PCM) is available. This PCM has a revised cold starling, fuel strategy.

Customers that complain of these symptoms should have the PCM replaced with the countermeasure part. Use the procedure listed below to determine if a new PCM is required.

REPAIR PROCEDURE

1. Perform the diagnostic procedure according to section F of the workshop manual. Service as required.
2. Verify the concern after cold soak.
3. Confirm that the vehicle's PCM is not a countermeasure part.
   NOTE: Verify that the engineering part no. F4PF-12A650-NA, F4PF-12A650-RA, F4PF-12A650-TA or F4PF-12A650-SA are not on the PCM. The engineering part no. is located just below the bar code label on the PCM connector.
4. If the symptom(s) is still present, install a new PCM.
   NOTE: To ensure correct part ordering, refer to the calibration number on the driver's side "B" pillar and the chart below.
5. List the date, dealer number and Service Bulletin number on the "PCM Replacement" label and install the label on to the radiator support.
   NOTE: This label informs technicians of the PCM change if future repairs are necessary.
6. Verify the repair after cold soak.

PARTS INFORMATION

Part Number New	Part Number Old	Calibration Number	Description	Qty.
ZZMV 18 888	ZZMA 18 888	4 58F R10 (Fed)	Powertrain Control Module	1
ZZMS 18 888	ZZMG 18 888	4 56H R10 (Fed)	Powertrain Control Module	1
ZZNY 18 888	ZZMY 18 888	4 56R R11 (Cal)	PowerTrain Control Module	1
ZZNZ 18 888	ZZMZ 18 888	4 56S R11 (Cal)	Powertrain Control Module	1

WARRANTY INFORMATION

(Applies To Verified Customer Complaints On Vehicles Covered Under Normal Warranty. Refer To The SRT Microfiche For Warranty Term Information.)

Warranty Type: A

Symptom Code: 03

Damage Code: 9W

Quantity: 1

Part Number Main Cause: See Parts Information (Use New Part Number)

Operation Number/Labor Hours: F0003XDX/0.5Hrs (max. for diagnostics)

F0812XRX/0.4Hrs (PCM R & R)