catalyst monitor inconclusive
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Filed Under (Ford) by admin on 24-02-2011
Drive Cycle Recommendations NOTE: The following procedure is designed to execute and complete the evaporative emission repair verification drive cycle and to clear the Ford P1000, inspection and maintenance (I/M) readiness code. When the ambient air temperature is below 4.4°C (40° or above 37.8° (100° or the altitude is above 2,438 meters (8,000 feet), the EVAP monitor will not run. If the F) C F), P1000 must be cleared in these conditions, the powertrain control module (PCM) must detect them once (twice on some applications) before the EVAP monitor can be bypassed and the P1000 cleared. The EVAP bypassing procedure is described in the following drive cycle. 1. Most OBD II monitors will complete more readily using a steady foot driving style during cruise or acceleration modes. Operating the throttle in a smooth fashion will minimize the time necessary for monitor completion. 2. Fuel tank level should be between one-half and three-quarters full with three-quarters full being the most desirable. 3. The evaporative monitor can only operate during the first 30 minutes of engine operation. When executing the procedure for this monitor, stay in part throttle mode and drive in a smooth fashion to minimize fuel slosh. Drive Cycle Preparation NOTE: For best results, follow each of the following steps as accurately as possible. 4. NOTE: This step bypasses the engine soak timer and resets OBD II monitor status. Install the scan tool. Turn the key ON with the engine OFF. Cycle the key off, then on. Select the appropriate vehicle and engine qualifier. Clear all diagnostic trouble codes (DTCs) and carry out a PCM reset. 5. Begin to monitor the following PIDs: ECT, EVAPDC, FLI (if available) and TP MODE. Press Diagnostic Data Link, PCM, PID/Data monitor and record, press trigger to select each PID, then start. 6. Start the engine without returning the key to the OFF position. Preparation for Monitor Entry WARNING: Strict observance of posted speed limits and attention to driving conditions are mandatory when proceeding through the following drive cycle. 7. NOTE: This step allows engine warm-up and provides intake air temperature (IAT) input to the PCM. Idle the vehicle for 15 seconds. Drive at 64 km/h (40 mph) until the ECT is at least 76.7° (170° C F). 8. Is IAT above 4.4° (40°F) and below 37.8°C (100° C F)? If not, continue with the following steps but note that the EVAP Monitor Bypass portion of the drive cycle (step 13) will be required to bypass the EVAP monitor and clear the P1000. 9. NOTE: This step executes the heated oxygen sensor (HO2S) monitor. Cruise at 64 km/h (40 mph) for 60 seconds. 10. NOTE: This executes the EVAP monitor if IAT is above 4.4°C (40° and below 37.8° (100°F). F) C NOTE: To initiate the monitor, TP MODE should equal PT, EVAPDC must be greater than 75%, and FLI must be between 15 and 85%. NOTE: Avoid sharp turns and hills. Cruise at 72 to 104 km/h (45 to 65 mph) for 10 minutes. 11. NOTE: This step executes the ISC portion of the Secondary Air/CCM. Bring the vehicle to a stop. Idle with the transmission in DRIVE (for automatic transmission) or NEUTRAL (for manual transmission) for two minutes. Pending Code and EVAP Monitor Bypass Check 12. NOTE: This determines if a pending code is preventing the clearing of P1000. NOTE: If the EVAP monitor is not complete and IAT was below 4.4° (40° or above 37.8° (100°F) temperature range in Step 8, or the altitude is above 2,438 meters (8,000 feet), C F) C the EVAP Monitor Bypass (Step 13) must be carried out. Using the scan tool, check for pending codes. Conduct normal repair procedures for any pending code concerns. Rerun any incomplete monitor. EVAP Monitor Bypass 13. NOTE: This allows the bypass counter to increment to two. NOTE: Do not repeat Step 4. Park the vehicle for a minimum of eight hours. Repeat Steps 5 through 12.
Filed Under (Chrysler) by admin on 03-07-2010
Theory of Operation The State of Change (SOC) catalyst monitor uses the signals from both the upstream and downstream O2 sensors to detect aging of the catalyst. Based on the fact that when a catalyst ages, it loses some of its Oxygen Storage Capacity (OSC). As a result, part of the untreated exhaust gases can breakthrough the catalyst and causes the downstream O2 sensor to deviate from its neutral (Stoichiometric) position. By observing the activities in the downstream O2 signal, the degradation level of catalyst can be detected. In general, the higher the downstream O2 sensor SOC value, the more exhaust gas breakthrough and the lower the OSC of the catalytic converter. WHEN MONITORED The monitor will run at between 1400 and 2300 RPM . It also runs between 40 and 70 KPA . SET CONDITION If the final State of Change index is within the calibrated fail threshold. Two trip fault. Three good trips to turn off the MIL
Filed Under (Jaguar) by admin on 28-11-2010
Powertrain DTC Summaries – OBD II FAULT DESCRIPTION MONITORING CONDITIONS CHECK ENGINE MIL (CK ENG) DEFAULT ACTION POSSIBLE CAUSES DTC Diagnostic Trouble Code. SYS The powertrain system with which the DTC is associated – EMS, TRANS, ABS/TC (DSC). DTC retrieval tools: OBD II – indicates that the DTC is an OBD II code and can be accessed via a generic scan tool or WDS. JAG – indicates that the DTC is not an OBD II code and is accessed only via WDS. Fault description. “DIAGNOSTIC MONITOR DRIVE CYCLE” for the particular DTC. Operate the vehicle as described to check for a reoccurrence of the DTC. Refer to pages 4 – 7. Use WDS Datalogger or Scan Tool to monitor specified engine parameter(s). 1 2 N OTHER Driver Warnings: N None R RED MIL / Message or Powertrain Warning Indicator A AMBER MIL / Message or Powertrain Warning Indicator C Charge indicator Control Module default action: Logged – DTC stored in ECM memory buffer; Flagged – DTC stored in ECM memory / CHECK ENGINE MIL activated. CM PIN ECM (SYS – EMS) / TCM (SYS – TRANS) Connector pin number(s) Possible causes are listed in the order of diagnostic checking. HIGH VOLTAGE – High voltage can be either sensor supply voltage (5 volts) or B+ voltage. 1 TRIP – indicates that the CHECK ENGINE MIL is activated by a fault occurring during ONE “TRIP”. 2 TRIPS – indicates that the CHECK ENGINE MIL is activated by a fault occurring during TWO CONSECUTIVE “TRIPS”. NO – indicates that the CHECK ENGINE MIL is not activated. OBD SYSTEM READINESS – ENGINE MANAGEMENT If DTC P1000 is flagged after DTCs have been cleared, all engine management OBD diagnostic monitor drive cycles HAVE NOT BEEN COMPLETED. If DTC P1111 is flagged after DTCs have been cleared, all engine management OBD diagnostic monitor drive cycles HAVE BEEN COMPLETED. OBD SYSTEM READINESS – TRANSMISSION Use WDS Datalogger “TOTAL NUMBER OF DTC SET” to determine if transmission OBD monitoring has been completed. Refer to page 7. OBD DIAGNOSTIC MONITORS The Engine Management and Transmission Control systems are continuously checked during vehicle operation by the Engine Control Module (ECM) and Transmission Control Module (TCM) on-board diagnostic (OBD) facilities. Powertrain OBD incorporates six diagnostic monitors. Each monitor has an associated group of DTCs. The diagnostic monitors will complete the diagnostic test(s) if a specified service “drive cycle” is carried out. The six diagnostic monitors are as follows: – – – – – – Heated Oxygen Sensors Monitor Adaptive Fuel Monitor Misfire Monitor Catalyst Efficiency Monitor Evaporative System Monitor Comprehensive Component Monitor (Engine Management / Transmission)
Filed Under (Nissan) by admin on 31-12-2010
IF YOU CONFIRM A rattle or buzz noise during acceleration OR A MIL ‘ON’ with DTC P1273 A/F Sensor ACTION • Inspect for a loose heat shield at the bottom of the Bank -1 catalyst. It may have “separated”. • If heat shield is loose replace the catalyst. SERVICE PROCEDURE 1. Put the vehicle on a hoist. 2. Inspect the Bank-1 catalyst heat shield for looseness by attempting to move heat shield by hand see Figure 2. 3. Inspect the Bank-1 heat shield welds for separation see Figure 3. 4. If the heat shield is loose so it can be moved by hand or any of the 3 heat shield welds are separated, replace the catalyst. 5. If the incident included DTC P1273, after replacing the catalyst, you must also complete the following steps: 1. Erase the DTC. 2. Clear self learning using CONSULT WORK SUPPORT mode. Select SELF LEARNING CONT then START followed by CLEAR.
Filed Under (GM) by admin on 13-06-2010
GM Accessories Headrest DVD System Display Monitor Inoperative (Install Cable Connector Clamps) 2004-2007 Buick Rainier 2008 Buick Enclave 2003-2008 Cadillac Escalade Models 2005-2008 Cadillac CTS, SRX, STS 2006-2008 Cadillac DTS 2003-2008 Chevrolet Avalanche, Silverado, Suburban, Tahoe, TrailBlazer Models 2006-2008 Chevrolet Colorado 2007-2008 Chevrolet Equinox, HHR 2003-2008 GMC Envoy Models, Sierra, Yukon Models 2006-2008 GMC Canyon 2007-2008 GMC Acadia 2007-2008 Pontiac Torrent 2005-2008 HUMMER H2 2006-2008 HUMMER H3 2007-2008 Saturn OUTLOOK 2005-2008 Saab 9-7X Condition Some customers may comment on an inoperative display monitor or monitors in the GM Accessories Headrest DVD System. Cause This condition may be caused by a loose connection at the display monitor cable connectors. These connectors are located at the lower rear part of both front seats. Two cables are routed to the display monitor in each seat.