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infiniti 1993 g20 service manual

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ALL INFINITI BRAKE NOISE/ JUDDER/ PEDAL FEEL DIAGNOSIS AND REPAIR MANUAL

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SERVICE PROCEDURE 1. Verify the condition by road testing the vehicle with the customer. 2. Determine the specific brake issue based on the description in the Service Information above. 3. Follow the appropriate repair procedure(s), listed on the following pages, for your specific issue BRAKE NOISE • Brakes can make a range of noises when applied or released. Some noises are normal and no repair action should be taken. • Use the following descriptions to identify the specific type of brake noise and the appropriate repair: Squeak noise when the brakes are cold: • Usually occurs during the first few stops in the morning. • This is a normal condition. No service action is necessary Squeak noise with the brakes at normal operating temperatures: • listed under Brake Service on page 5 of this bulletin and the appropriate Service Manual procedures. • Refer to technical bulletins specific to the model of vehicle regarding this issue. If there are no bulletins for the car you are working on, install OE type pads using the information Notes about brake pads and brake noise: Original Equipment (OE) brake pads are installed on all current Infiniti vehicles at the factory. The OE pads use a Non-asbesto • s Organic (NAO) compound. The NAO material provides state of the art resistance to squeal noise. • ervice parts and must be used if replacing brake pads under the terms of • ted under Brake Service on page 5 of this bulletin and the appropriate Service Manual Gro n s after coming to a stop: • It is a normal condition. No repair or service is necessary. Groan noise during stopping: • Usually caused by glazing of the rotor’s surface as a result of heavy or frequent braking. • Refer to technical bulletins specific to the model of vehicle regarding this issue. • Replace the brake pads, then resurface the rotors and finish them with sand paper. Refer to Brake Service on page 5 for additional detail. Single clunk noise from front suspension when applying the brakes: • The noise is a result of the brake pads shifting in the direction of rotor rotation when the brakes are applied. Can be duplicated by lightly touching the brake pedal. • • If the brake pedal is pushed hard, the noise is less likely to occur. Make sure the brake pads and pad hardware (shims, springs, clips, etc) are installed correctly. Refer to ASIST for vehicle specific brake service information. Refer to Brake Service on page 5 for additional detail. Mull e he engine is started: • st er models, the self check occurs the first aches 5 mph after the engine is started. ors or drums. • WARNING: Brake dust may be hazardous if inhaled. Refer to the Service Manual (ESM) for brake • n and lubrication of brake pads, CAUTION: Do not get grease on the brake pad friction surface. A • Brake Judder is caused by rotor thickness variation and/or rotor run out.

2000-2002 Infiniti G20 MIL “ON” REAR O2 SENSOR DTC P0138/P0139/P0140 Repair Manual

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SERVICE PROCEDURE You will be performing the following, as required: • Determine the DTC Stored in ECM from the CONSULT-II Self-diagnosis results. • ECM Part Number Check to determine if this bulletin applies. • ECM Reprogramming (required if the ECM P/N in the vehicle matches one of those listed under “Current ECM P/N” in Chart A -page 2). • Replacing the Rear Oxygen Sensor (required if ECM Reprogramming is needed). Determine the DTC Stored in ECM: 1. Determine which DTC code is stored in the vehicle’s ECM by performing CONSULT-II Self-Diagnosis. 2. Print out the Self-Diagnosis results for use in ECM Part Number Check , below. See Figure 1 for an example of the CONSULT-II Self-Diagnosis printout. Figure 1 SELF-DIAG RESULTS SYSTEM ENGINE DATE 03/15/2002 3:35:35 P/N 23710-7J400 DTC Code TP020169 DTC RESULTS TIME HO2S2 (B1) 3 [P0138] Current ECM Part Number 2/3 ECM Part Number Check 1. Compare the vehicle’s current ECM P/N (from your CONSULT-II Self Diagnosis printout) to those shown under Current ECM P/N in Chart A , below: Chart A – Current ECM P/N’s: Vehicle Current ECM P/N 2000 M/T 23710-7J400, -7J401, -7J402, -7J460 2000 A/T 23710-7J410, -7J411, -7J412, 7J470 2001-2002 M/T 23710-6J105, -6J106, -6J107, -6J108, 6J170 2001-2002 A/T 23710-6J115, -6J116, -6J117, -6J118, -6J180 A. If the ECM P/N in the vehicle matches one of those listed under “Current ECM P/N” in Chart A (above): • Look in the “Vehicle” Column in Chart A (above) and determine the vehicle “configuration” (i.e. 2002 M/T). Make a note of the vehicle configuration and perform ECM Reprogramming , below. B. If the ECM P/N in the vehicle does not match one of those listed under “Current ECM P/N” in Chart A (above): • This bulletin does not apply. Use the appropriate Electronic Service Manual (ESM) to further diagnose and repair the incident. ECM Reprogramming 1. Perform ECM Reprogramming to install the latest available ECM data. • If you are unfamiliar with ECM Reprogramming, click here to link to the “ECM Reprogramming For Infiniti Vehicles” general procedure or refer to Attachment A in the print copy of this bulletin. • For those familiar with ECM Reprogramming, perform the following:

INFINITI BRAKE NOISE/ JUDDER/ PEDAL FEEL DIAGNOSIS AND REPAIR MANUAL

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APPLIED VEHICLES: All Infiniti SERVICE INFORMATION • This bulletin is to assist you in responding to customer questions about brake operation, and provides diagnostic and repair information for each item listed, if any should occur. • Most brake issues fall into the following categories: a. Brake Noise: A squeak, squeal, clunk, or groan that occurs when the brakes are applied or released. b. Brake Judder: A vibration that can be felt in the vehicle, steering wheel, or brake pedal when the brakes are applied. c. Pedal Feel: The effort needed to operate the brakes is too high or too low. SERVICE PROCEDURE 1. Verify the condition by road testing the vehicle with the customer. 2. Determine the specific brake issue based on the description in the Service Information above. 3. Follow the appropriate repair procedure(s), listed on the following pages, for your specific issue. BRAKE NOISE • Brakes can make a range of noises when applied or released. Some noises are normal and no repair action should be taken. • Use the following descriptions to identify the specific type of brake noise and the appropriate repair: Squeak noise when the brakes are cold: • Usually occurs during the first few stops in the morning. • This is a normal condition. No service action is necessary Squeak noise with the brakes at normal operating temperatures: • listed under Brake Service on page 5 of this bulletin and the appropriate Service Manual procedures. • Refer to technical bulletins specific to the model of vehicle regarding this issue. If there are no bulletins for the car you are working on, install OE type pads using the information Notes about brake pads and brake noise: Original Equipment (OE) brake pads are installed on all current Infiniti vehicles at the factory. The OE pads use a Non-asbesto • s Organic (NAO) compound. The NAO material provides state of the art resistance to squeal noise. • ervice parts and must be used if replacing brake pads under the terms of • ted under Brake Service on page 5 of this bulletin and the appropriate Service Manual Gro n s after coming to a stop: • It is a normal condition. No repair or service is necessary. These pads are available as s the Infiniti new car warranty. Loud continuous squeak/squeal noise: • Occurs with or without braking. • This is a normal brake function. It occurs when the brake pad wear indicators contact the rotor. It indicates the brake pads are worn out and need to be replaced. Install new brake pads using the information lis procedures. anoise when slightly releasing the brake • This is sometimes called “creep groan

1999-2001 Infiniti Q45 MIL “ON” REAR O2 SENSOR DTC SERVICE PROCEDURE

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SERVICE PROCEDURE You will be performing the following, as required: • Determine the DTC Stored in ECM from the CONSULT-II Self-diagnosis results. • ECM Part Number Check to determine if this bulletin applies. • ECM Reprogramming (required if the ECM P/N in the vehicle matches one of those listed under “Current ECM P/N” in Chart A -page 2). • Replacing the Rear Oxygen Sensor (required if ECM Reprogramming is needed). Determine the DTC Stored in ECM: 1. Determine which DTC code is stored in the vehicle’s ECM by performing CONSULT-II Self-Diagnosis. 2/4 2. Print out the Self-Diagnosis results for use in ECM Part Number Check , below. See Figure 1 for an example of the CONSULT-II Self-Diagnosis printout. ECM Part Number Check 1. Compare the vehicle’s current ECM P/N (from your CONSULT-II Self Diagnosis printout) to those shown under Current ECM P/N in Chart A , below: Chart A – Current ECM P/N’s: Vehicle Current ECM P/N 1999-2001 Q45 23710-3H000, -3H001, -3H005, -3H006, -3H007 A. If the ECM P/N in the vehicle matches one of those listed under “Current ECM P/N” in Chart A (above): • Perform ECM Reprogramming on page 3. B. If the ECM P/N in the vehicle does not match one of those listed under “Current ECM P/N” in Chart A (above): • This bulletin does not apply. Use the appropriate Electronic Service Manual (ESM) to further diagnose and repair the incident. SELF-DIAG RESULTS SYSTEM ENGINE DATE 01/24/2002 5:35:07 P/N 23710-3H000 DTC Code TP020024 DTC RESULTS TIME HO2S2 (B1) 3 [P0138] Current ECM Part Number 3/4 ECM Reprogramming 1. Perform ECM Reprogramming to install the latest available ECM data. • If you are unfamiliar with ECM Reprogramming, click here to link to the “ECM Reprogramming For Infiniti Vehicles” general procedure or refer to Attachment A in the print copy of this bulletin. • For those familiar with ECM Reprogramming, perform the following:

1993 Ford Crown Victoria V8-281 4.6L SOHC Engine – Lean Driveability Symptoms Manual

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1. Look at the BARO PID. Refer to the Barometric Pressure Reference Chart in this article. At sea level, BARO should read about 159 Hz (29.91 in. Hg). As a reference, Denver, Colorado at 1524 meters (5000 ft.) altitude should be about 144 Hz (24.88 in.Hg). Normal learned BARO variability is up to +/- 6 Hz (+/- 2 in. Hg.). If BARO indicates a higher altitude than you are not at (7 or more Hz lower than expected), you may have MAF contamination. If available, Service Bay Diagnostic System (SBDS) has a Manifold Absolute Pressure (MAP) sensor that can be used as a barometric pressure reference. Use “MAP/BARO” test under “Powertrain,” “Testers and Meters.” Ignore the hookup screen. Connect GP2 to the reference MAP on the following screen. 2. On a fully warmed up engine, look at Long Term Fuel Trim at idle, in Neutral, A/C off, (LONGFT1 and/or LONGFT2 PIDs). If it is more negative than -12%, the fuel system has learned lean corrections which may be due to the MAF sensor over-estimating air flow at idle. Note that both Banks 1 and 2 will exhibit negative corrections for 2-bank system. If only one bank of a 2-bank system has negative corrections, the MAF sensor is probably not contaminated. 3. On a fully warmed up engine, look at MAF voltage at idle, in Neutral, A/C off (MAF V PID). If it’s 30% greater than the nominal MAF V voltage listed in the Powertrain Control/Emissions Diagnosis (PC/ED) Diagnostic Value Reference Charts for your vehicle, or greater than 1.1 volts as a rough guide, the MAF sensor is over-estimating air flow at idle. 4. If at least tow of the previous three steps are true, proceed to disconnect the MAF sensor connector. This puts the vehicle into Failure Mode and Effects Management (FMEM). In FMEM mode, air flow is inferred by using rpm and throttle position instead of reading the MAF sensor. (In addition, the BARO value is reset to a base/unlearned value.) If the lean driveability symptoms go away, the MAF sensor is probably contaminated and should be replaced. If the lean driveability symptoms do not go away, go to the PC/ED Service Manual for the appropriate diagnostics.