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PEUGEOT 306 1.4 / 1.8(16V) and 406 1.8(16V) MODELS FROM 1997 to 2002 – IDLE CONTROL PROBLEMS. SAGEM SL96 (3 row, 55 pin) ECU suffers from damage to idle control CAUSED BY DEFECTIVE COILS. Replacing ECU WITHOUT REPLACING COILS WILL RESULT IN NEW ECU FAILING WITHIN VERY SHORT TIME FRAME. Sagem SL96 Symptoms 1) Car suffers idle control problems manifested as rough running at idle and stalling at traffic lights. 2) Check engine light usually illuminates with coil pack fail and idle control fault
codes. Diagnostic Checklist 1) Check fault codes – if fault code does not identify which coil has failed, REPLACE BOTH. Coil failure almost guarantees ECU failure but run car with new coil(s) – if idle control is correct – and idle control fault code does not reappear then ECU has probably survived

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Circuit Description The auxiliary brake system provides hydraulic fluid flow within the brake booster if the engine is OFF and the brake is applied. The system consists of the following 3 basic components: • The power brake booster pump motor relay • The power brake booster fluid flow switch • The power brake booster pump motor The multifunction alarm module (MFAM) performs a 4 second bulb check on the AUX BRAKE indicator immediately after the engine is cranked or started. The MFAM illuminates the indicator by supplying voltage to the lamp. During the bulb check, the MFAM also performs a diagnostic which tests the power brake booster pump motor relay, the power brake booster fluid flow switch and the power brake booster pump circuitry for electrical faults. The AUX BRAKE indicator remains illuminated if the MFAM detects an electrical fault in the system. The MFAM also sounds an audible warning when the AUX BRAKE indicator illuminates. Test Description The numbers below refer to the step numbers on the diagnostic table. 3. This step tests if the multifunction alarm module is supplying voltage to the brake warning indicator supply voltage 2 circuit. 5. This step tests for a 12 volt signal from the MFAM. 7. This step tests if the MFAM is capable of supplying ground to the brake booster fluid flow switch signal circuit. Schematic Reference: Brake Warning System Schematics Did you review the Hydraulic Brake System Description and Operation and perform the necessary inspections? 1 Crank or start the engine while observing the AUX BRAKE indicator. 2 Does the AUX BRAKE indicator illuminate for 4 seconds and then turn OFF and remain OFF? 1. Turn OFF the ignition. 2. Disconnect the MFAM harness connector. 3. Turn ON the ignition. 3 Does the AUX indicator illuminate? 4 1. Turn OFF the ignition. 2. Reconnect the MFAM harness connector. 3. Apply the brake. Does the power brake booster pump motor run when the brake is applied? 5 1. Disconnect the harness connector of the power brake booster pump motor relay, which is located in the Maxi- Fuse center. 2. Connect a test lamp between the brake switch signal circuit and a good ground. 3. Crank or start the engine. Does the test lamp illuminate for 4 seconds and then turn OFF?

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Steering Column Switches Refer to Wiring Diagrams Cell 13 for schematic and connector information. Special Tool(s) Inspection and Verification 1. Verify the customer concern. 2. Visually inspect for obvious signs of mechanical or electrical damage. Visual Inspection Chart Mechanical Multi-function switches Ignition switch 3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step. 4. If the concern is not visually evident, verify the symptom and refer to the Symptom Chart. Symptom Chart Symptom Chart The ignition switch is inoperative No power in ACC No power in RUN No power in START The ignition key is hard to turn Unable to remove the key from the ignition Condition Pinpoint Tests Pinpoint Test A: The Ignition Switch Is Inoperative Normal Operation The ignition receives overload protected battery voltage from the battery junction box (BJB) fuse 8 (30A) through circuit 30-BB9 (RD). Possible Causes Circuit 30-BB9 open Ignition switch

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Condition Some customers may comment on intermittent illumination of the Service 4WD light. Upon investigation, the technician may find DTC C0374 set. The customer may also comment on intermittent erratic operation of the 4WD or AWD system after driving through rain/snow or simply going through a car wash. Cause The speed sensor signal may have become corrupted. Possible openings in the speed sensor wire insulation (twisted pairs) can allow water intrusion. Also, wire connections contaminated by water may result in short circuits and erroneous speed sensor readings. This most often occurs on the rear speed sensor circuit. Correction Inspect the wiring harness to the transfer case speed sensors. On Rainier, TrailBlazer, Envoy and 9-7X models, fabricate a replacement speed sensor harness between the C101 connector and the speed sensors. Completely inspect and test all wiring. Refer to Speed Signal, Front Axle Actuator, and Indicators schematic in SI. Replace the affected twisted pairs. Do not over-twist the two wires in the replacement harness. Wires should be twisted at a rate of 9 revolutions per foot. Use service connector pack, P/N 88987993, at the speed sensor end and terminal, P/N 15326267, at C101. Terminal testing tools and service terminals can be found in Terminal Repair Kit J 38125. Terminals are available from SPX/Kent-Moore. Call 1-800-GM-TOOLS (1-800-468-6657). The smaller transfer case harness splices into the larger chassis harness a few inches in front of the

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Fig. Fig. 1: Glow plug system schematic Fig. Fig. 2: Dropping resistor and glow plug relay locations Fig. Fig. 3: Thermo switch location Fig. Fig. 4: Dropping resistor check 1. To test the dropping resistor, check for continuity across the terminals as described in the illustration. If no continuity exists, replace the unit. 2. To test the thermo switch, first remove the switch. Submerge the end of the switch in water and raise the temperature gradually. The switch should be off at 126-140°F (53-60°C) or lower. The switch should be on at 134-145°F (57-63°C) or higher. If not, replace the switch. REMOVAL & INSTALLATION See Figure 5 Fig. Fig. 5: Location of the glow plugs The glow plugs are located under the injection nozzles, and are threaded into the cylinder head. 1. Disconnect the negative (-) battery cable. 2. Disconnect the glow plug and unscrew it from the engine. To install: 3. Lubricate with anti-seize compound before installing the plug. 4. Install and tighten the plug to 65 ft. lbs. (88 Nm). 5. Reconnect the plug wiring. 6. Connect the battery cable and check operation.