Code 32. Diagnostic Trouble Code 32
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1 Code 32 Diagnostic Trouble Code 32
2 EGR Solenoid Circuit CIRCUIT DESCRIPTION The ECM operates a solenoid to control the Exhaust Gas Recirculation (EGR) valve. This solenoid is normally close EGR valve. DTC 32 WILL SET WHEN The ECM monitors EGR effectiveness by de-energizing the EGR control solenoid; thereby, shutting "OFF" vacuum counts will be greater than they were during normal EGR operation. If the change is not within the calibrated window, a The ECM will check EGR operation when: ^ Engine speed is above 1500 rpm. ^ Engine vacuum is between 15 and 60 kpa. ^ Throttle angle between 6 and 30%. ^ No change in throttle position while test is being run, max 4%. ^ EGR on threshold 98%. ^ Short term fuel trim is less than 6 counts after 3 seconds. ACTION TAKEN (ECM WILL DEFAULT TO) The Malfunction Indicator Lamp (MIL) will illuminate. DTC 32 WILL CLEAR WHEN Conditions for fault are no longer present and Tech 1 "Clear DTCs" function is used or 50 ignition switch keycycles 10 seconds. DTC CHART TEST DESCRIPTION Number(s) below refer to circled number(s) on the diagnostic chart. 1. By grounding the diagnostic terminal, the EGR solenoid should be energized and allow vacuum to be applied to the 2. The MIL should also flash while the diagnostic terminal is grounded. If the tight does not flash, this may indicate tha 3. When the diagnostic terminal is ungrounded, the vacuum to the EGR valve should bleed off through a vent in the s 4. This test will determine if the electrical control part of the system is at fault, or if the connector or solenoid is at fault
3 5. This system uses a negative backpressure valve which should hold vacuum with engine "OFF." 6. When engine is started, exhaust backpressure should cause vacuum to bleed off and valve should fully close. DIAGNOSTIC AIDS ^ Before replacing ECM, use an ohmmeter and check the resistance of each ISCM controlled relay and solenoid coil Systems > Component Tests and General Diagnostics > ECM QDR Check Procedure Refer to Engine Control Modu checked. Replace any solenoid where resistance measures less than 20 ohms. Code 35
4 Diagnostic Trouble Code 35
5 IAC Circuit CIRCUIT DESCRIPTION The control module controls engine idle speed with the Idle Air Control (IAC) valve. To increase idle speed, the con decrease idle speed, it extends the IAC valve pintle towards its seat, reducing bypass air flow. A Tech 1 scan tool will r (higher idle). The lower the counts indicate less air is allowed to bypass (lower idle). DTC 35 WILL SET WHEN The PCM sees a different reading in desired IAC and actual IAC. ACTION TAKEN (PCM WILL DEFAULT TO) None. The PCM turns "ON" the Malfunction Indicator Lamp (MIL). DTC 35 WILL CLEAR WHEN Conditions for fault are no longer present and Tech 1 "clear DTCs" function is used or 50 ignition switch keycycles 10 seconds. DTC CHART TEST DESCRIPTION Number(s) below refer to circled number(s) on the diagnostic chart. 1. The IAC tester is used to extend and retract the IAC valve. Valve movement is verified by an engine speed change 2. This step checks the quality of the IAC movement in Step 1. Between 700 rpm and about 1500 rpm, the engine sp retracted beyond the control range (about 1500 rpm), it may take many flashes in the extend position before engine sp may be normal. 3. Steps 1 and 2 verified proper IAC valve operation while this step checks the IAC circuits. Each lamp on the node li either light is "OFF" or does not flash red and green, check the circuits for faults beginning with poor terminal contacts. IAC VALVE RESET PROCEDURE ^ Disconnect negative battery cable for 10 seconds then reconnect cable battery. ^ Key "ON," engine "OFF." ^ Ignition "OFF" for 10 seconds. DIAGNOSTIC AIDS A slow, unstable, or fast idle may be caused by a non-iac system problem that cannot be overcome by the IAC val idle is too high. The following checks should be made to repair a non-iac system problem. ^ VACUUM LEAK (High Idle) - If idle is too high, stop the engine. Also, check for binding of throttle blade or linkage
6 ^ SYSTEM TOO RICH (Low Air/Fuel Ratio) - The idle speed will be too low. ^ THROTTLE BODY - Remove IAC valve and inspect bore for foreign material. ^ IAC VALVE ELECTRICAL CONNECTIONS - IAC valve connections should be carefully checked for proper conta ^ CRANKCASE VENTILATION VALVE - An incorrect or faulty crankcase ventilation valve may result in an incorrec ^ A/C COMPRESSOR OR RELAY FAILURE - Refer to A/C diagnosis if circuit is shorted to ground. ^ If intermittent poor driveability or idle symptoms are resolved by disconnecting the IAC, carefully recheck connec ^ Refer to Diagnosis By Symptom / Stalls / Rough, Unstable Or Incorrect Idle See: Computers and Control Sy
7 DTC 83 TCC PWM Solenoid Circuit Fault
8 TCC PWM Solenoid Circuit CIRCUIT DESCRIPTION The Torque Converter Clutch (TCC) Pulse Width Modulation (PWM) is used in combination with the TCC solenoid t fluid to the torque converter, and is attached to the control valve body within the transmission. The Powertrain Control (PCM) supplies a ground allowing current to flow through the solenoid coil according to the duty cycle (percentage of O "OFF" time). This current flow through the solenoid coil creates a magnetic field that magnetizes the solenoid core. The magnetized core attracts the checkball to seat against spring pressure. This blocks the exhaust for the TCC signal fluid 2-3 drive fluid to feed the TCC signal circuit. The TCC signal fluid pressure acts on the TCC regulator valve to regulate pressure and to apply fluid pressure to the torque converter clutch shift valve. When the TCC shift valve is in the apply regulated apply fluid pressure is directed through the TCC valve to apply the torque converter clutch. DTC 83 WILL SET WHEN ^ The PCM commands the solenoid "ON" and voltage remains high (B+). or ^ The PCM commands the solenoid "OFF" and voltage remains low (zero volts). ^ All conditions met for 2 seconds. ACTION TAKEN (PCM will default to) ^ Inhibit TCC operation. ^ Inhibit 4th gear operation if in hot mode. DTC 83 WILL CLEAR WHEN The fault condition(s) no longer exist, and the ignition switch is cycled "OFF" then "ON." DTC CHART TEST DESCRIPTION Number(s) below refer to circled number(s) on the diagnostic chart. 1. This test will check if the PCM is commanding the TCC solenoid "ON." 2. This test will check for voltage to the solenoid. DIAGNOSTIC AIDS Check all connections at the transmission pass-thru connector. If they are OK, refer to "PCM Intermittent DTC(s) or Performance."
9
10 IAC Valve
11 IAC Valve NOTE: The IAC valve is an electrical component and must not be soaked in any liquid cleaner or solvent. Otherwise d IMPORTANT: Thread-mounted IAC Valves have a dual taper, 10 mm diameter, pintle. The flange-mounted IAC valve Any replacement of an IAC valve must have the correct part number, with the appropriate pintle taper and diameter REMOVE OR DISCONNECT 1. Electrical connector. 2. IAC valve. ^ On thread-mounted units, use a 32 mm (1-1/4") wrench. ^ On flange-mounted units, remove screw assemblies. 3. IAC valve gasket or 0-ring and discard. CLEAN ^ Thread-mounted valve - Old gasket material from surface of throttle body assembly to insure proper seal of new ga ^ Flange-mounted valve - IAC valve surface on throttle body to assure proper seal of new 0-ring and contact of IAC v NOTE: If the IAC valve was removed during service, its operation may be tested electrically with the IAC system an electrically. Before installing an IAC valve, measure the distance between the tip of the valve pintle and the mounting s This may be done electrically using on IAC system analyzer motor tester (J or BT-8256K). MEASURE ^ Distance between tip of IAC valve pintle and mounting flange. - If greater than 28 mm, use finger pressure to slowly retract the pintle. The force required to retract the pintle of a n IMPORTANT: No physical adjustment of the IAC valve assembly is required after installation. The IAC valve pintle is r module then has a reset procedure to set the correct pintle position. Proper idle regulation should result. INSTALL OR CONNECT 1. IAC valve into throttle body as follows: ^ Thread-mounted valve - Install with new gasket. ^ Flange-mounted valve - Install with new lubricated 0-ring, using attaching screw assemblies. Tighten Thread-mou attaching screw assemblies to 3.2 Nm (28.0 lb. in.). 2. Electrical connector to IAC valve. 3. Reset IAC valve pintle position: ^ Remove battery cable for 10 seconds. ^ Ignition "ON," engine "OFF" for 5 seconds. ^ Ignition "OFF," for 10 seconds. Egr cleaning PROCEDURE WARNING Appropriate eye protection should be worn when cleaning the EGR system to prevent injury to eyes. CAUTION When cleaning intake manifold EGR passages, care should be taken to ensure that all loose particles are completely removed to prevent them from clogging the EGR valve or from being ingested into the engine, as damage to system or engine may occur. - Remove throttle body. - Disconnect vacuum hose or electrical connector from EGR valve, then remove EGR valve to manifold
12 retaining bolts and valve. - Remove deposits from EGR ports by hand using a suitable drill bit and screwdriver. - Brush small deposits down EGR port into passages, then using compressed air, blow ports clean. Solvents should not be used to clean EGR valve or passages, since damage to system may result. - Install EGR valve, using new gasket. - Install throttle body. EGR Valve REMOVAL: - Remove air cleaner. - Remove EGR valve vacuum tube at valve. - Remove bolts or nuts. - Remove EGR valve and gasket from manifold. Discard gasket. INSPECTION: If the EGR passage indicates excessive build up of deposits, the passage should be cleaned. Care should be taken from being ingested into the engine. CLEANING: CAUTION: DO NOT wash the EGR valve in solvents or degreaser as permanent damage to the valve diaphragm m valve.
13 - With a wire wheel, buff exhaust deposits from mounting surface and around valve. - Look for exhaust deposits in valve outlet. Remove deposit build up with a screwdriver. - Clean mounting surfaces of intake manifold and valve assembly. INSTALLATION: - Install new EGR gasket. - Install EGR valve to manifold. - Install bolts or nuts. Tighten to 20 Nm (15 lb.ft.). - Connect vacuum tube to EGR valve. - Install air cleaner assembly. - Check operation of EGR system to ensure correct operation.
14 EGR And Solenoid REMOVAL: - Remove EGR valve vacuum tube at valve. - Remove bolts or nuts. - Remove EGR valve and gasket from manifold. Discard gasket. INSPECTION: If the EGR passage indicates excessive build up of deposits, the passage should be cleaned. Care should be taken all loose particles are completely removed to prevent them from clogging the EGR valve of from being ingested into the CLEANING: CAUTION: DO NOT wash the EGR valve in solvents or degreaser as permanent damage to the valve diaphragm m sand blasting of the valve is not recommended since this can affect the operation of the valve. - With a wire wheel, buff exhaust deposits from mounting surface and around valve. - Look for exhaust deposits in valve outlet. Remove deposit build up with a screwdriver. - Clean mounting surfaces of intake manifold and valve assembly. INSTALLATION: - Install new EGR gasket. - Install EGR valve to manifold. - Install bolts or nuts. Tighten to 20 Nm (15 lb.ft.) - Connect vacuum tube to EGR valve. - Check operation of EGR system to ensure correct operation. If you are satisfied with my answer, Please Rate my answer by clicking the rating button so I can get credit for my work. I m not always going to be giving you good news, so please don't let this stand in the way of you accepting my answer..it does not cost you more money and we will still be able to communicate,,.please understand, i can not see, hear or touch the vehicle and only know what you tell me. Bonuses and positive feedback are appreciated.. if you are not satisfied with my answer, please do not leave bad feedback,i will gladly opt out and let another expert handle the question..if i have sent any diagrams, please print them..sometimes you may need to right click the image [,then save picture as]to save it to your computer so you can open it with your picture program...please ask if you need more help.
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