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Engine Controls - Self-Diagnostics: Diagnosis Saab 9-5 I

Testing & Diagnostics ~374 words

SELF-DIAGNOSTIC SYSTEM

CAUTIONElectronic components used in control systems are designed to carry very low voltages. As little as a 30-volt charge created by static electricity can cause a total or degrading failure in ECM or other electronic components containing integrated circuits. Before servicing such components, ground yourself and work area to discharge stored static electricity. Repeat grounding process periodically during service procedure.

MALFUNCTION INDICATOR LIGHT (MIL) INSPECTION

Note. Malfunction Indicator Light (MIL) on instrument panel may also be referred to as CHECK ENGINE light. Inspect MIL to ensure it is operational and will come on if a DTC is stored.

  1. Turn ignition on with engine off. MIL should come on and remain on. If MIL does not come on, check bulb circuit on instrument panel and wiring circuit between MIL and ECM. ECM is located in engine compartment behind partition on left side. (Схема №1), (Схема №3) or (Схема №4). See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3491) article.
  2. Start engine and ensure MIL goes off. If MIL remains on with engine running, a malfunction is detected. Proceed to «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-2691-S25681352722000041100000).

TESTING & REPAIR PROCEDURE

Following check list of procedures is suggested to be followed to ensure correct diagnosis and repair

  1. Record Customer Complaint Ensure all customer complaints or observations are recorded. Test drive vehicle with customer when necessary for malfunction verification.
  2. Retrieve Diagnostic Trouble Codes (DTCs) Connect TECH 2 scan tool. Retrieve DTCs from ALL systems. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-2691-S25681352722000041100000) .
  3. Visual Inspection Inspect all connectors of suspect circuit or component. Ensure all connections are clean and tight.
  4. Confirm Symptoms & DTCs Determine whether customer's complaint corresponds with symptoms related to stored DTCs. If it does, DTC is probably set by primary fault and is not a secondary stored code.
  5. Diagnose & Repair DTCs Perform diagnosis and repair procedures as needed. See applicable «DIAGNOSTIC TESTS»(ref-2691-S42355653582000041100000) . If no codes are present, proceed to «TROUBLE SHOOTING - NO CODES»(ref-3004) article for diagnosis by symptom (i.e., rough idle, no start, etc.).
  6. Confirmation Procedure After repairs have been completed, clear all DTCs. See «CLEARING DTCS»(ref-2691-S32790697922000041100000) . Perform road test. Confirm that no DTCs are present and all symptoms and/or complaints have been repaired.

RETRIEVING DIAGNOSTIC TROUBLE CODES

Access Data Link Connector (DLC) under left side of instrument panel. Connect and operate TECH 2 scan tool in accordance with manufacturer's instructions. Turn ignition on. Following scan tool manufacturer's instructions, retrieve any DTCs stored in memory. See DIAGNOSTIC TROUBLE CODES (DTC) table.

DTCMalfunction Indicated
P0100MAF Sensor Circuit No Signal
P0102MAF Sensor Low Input
P0103MAF Sensor High Input
P0106MAP Sensor Circuit Performance Problem
P0107MAP Sensor Circuit Open Or Shorted To Ground
P0108MAP Sensor Circuit Shorted To Battery Voltage
P0112IAT Sensor Circuit Shorted To Ground
P0113IAT Sensor Circuit Open Circuit Or Shorted To Battery Voltage
P0116ECT Sensor Circuit Performance Problem
P0117ECT Sensor Circuit Shorted To Ground
P0118ECT Sensor Circuit Open Circuit Or Shorted To Battery Voltage
P0125Excessive Time To Enter Closed Loop
P0131Front HO2S Circuit Low Voltage Signal
P0132Front HO2S Circuit High Voltage Signal
P0133Front HO2S Circuit Slow Response
P0134Front HO2S Circuit No Activity Detected
P0137 (1)Rear HO2S Circuit Low Voltage Signal
P0138Rear HO2S Circuit High Voltage Signal
P0140Rear HO2S Circuit No Activity Detected
P0171Long Term Fuel Trim Lean Mixture
P0172Long Term Fuel Trim Rich Mixture
P0300Random Misfire Detected
P0301Cylinder 1 Misfire Detected
P0302Cylinder 2 Misfire Detected
P0303Cylinder 3 Misfire Detected
P0304Cylinder 4 Misfire Detected
P0305 (2)Cylinder 5 Misfire Detected
P0306 (2)Cylinder 6 Misfire Detected
P0327Low Knock Signal Input From IDM (2) (Bank 1)
P0332Low Knock Signal Input From IDM (2) (Bank 2)
P0336CKP Sensor Performance Problem
P0337CKP Sensor Signal No Input
P0340CMP Sensor Signal Faulty Operation
P0410 (1)Secondary Air Injection Flow Problem
P0420Three-Way Catalyst Malfunction
P0441EVAP Purge Valve Malfunction
P0442EVAP System Small Leak Detected
P0444EVAP Purge Valve Circuit Open/Short To Ground
P0445EVAP Purge Valve Circuit Short To Battery Voltage
P0452FTP Sensor Circuit Short To Ground
P0453FTP Sensor Circuit Open/Short To Battery Voltage
P0455EVAP Purge System Large Leak
P0501VSS Input Signal Outside Limits
P0502VSS No Input Signal
P0506Idle Speed Control; Idle Speed Too Low
P0507Idle Speed Control; Idle Speed Too High
P0605Internal Control Module Malfunction
P1105 (3)CAAP Sensor Hose Leak
P1106CAAP Sensor Performance Problem
P1107CAAP Sensor Circuit Open/Short To Ground
P1108CAAP Sensor Circuit Short To Battery Voltage
P1110CAB Valve Performance Problem
P1135HO2S-1 Heater Circuit Current Too Low
P1136HO2S-1 Heater Circuit Current Too High
P1141HO2S-2 Heater Circuit Current Too Low
P1142HO2S-2 Heater Circuit Current Too High
P1171Short Term Fuel Trim Lean Mixture
P1172Short Term Fuel Trim Rich Mixture
P1181Long Term Fuel Trim (Additive) Lean Mixture
P1182Long Term Fuel Trim (Additive) Rich Mixture
P1230TPS Circuits No. 1 & 2; Voltage Sum Out Of Range
P1240Throttle Motor Circuit Shorted
P1251 (4)Throttle Motor Full Pulse Width Modulation In Closing Direction
P1252Throttle Motor Full Pulse Width Modulation In Open Direction And No Motor Current
P1253Throttle Motor Full Pulse Width Modulation While Cranking
P1260 (4)Throttle Return Spring Insufficient Return Force
P1261Throttle Binding
P1263 (4)Throttle Moved Manually While Engine Was Running
P1264Throttle Open When Pedal Is Released
P1300Random Misfire Detected; Potential Catalyst Damage
P1301Cylinder 1 Misfire Detected; Potential Catalyst Damage
P1302Cylinder 2 Misfire Detected; Potential Catalyst Damage
P1303Cylinder 3 Misfire Detected; Potential Catalyst Damage
P1304Cylinder 4 Misfire Detected; Potential Catalyst Damage
P1305 (2)Cylinder 5 Misfire Detected; Potential Catalyst Damage
P1306 (2)Cylinder 6 Misfire Detected; Potential Catalyst Damage
P1310Ignition Discharge Module No Power (2) (Bank 1)
P1312 (3)Combustion Detection Cyls. 1 & 2 Faulty Circuit
P1313 (2)Combustion Detection Bank 1 Faulty Circuit
P1320 (2)Ignition Discharge Module No Power (Bank 2)
P1324 (2)Combustion Detection Bank 2 Faulty Circuit
P1334 (3)Combustion Detection Cyls. 3 & 4 Faulty Circuit
P1390 (3)Random Misfire Detected; Potential Catalyst Damage, Fuel Level Low
P1390 (2)Random Misfire Detected; Potential Catalyst Damage, Fuel Level Low
P1391Cylinder 1 Misfire Detected; Potential Catalyst Damage, Fuel Level Low
P1392Cylinder 2 Misfire Detected; Potential Catalyst Damage, Fuel Level Low
P1393Cylinder 3 Misfire Detected; Potential Catalyst Damage, Fuel Level Low
P1394Cylinder 4 Misfire Detected; Potential Catalyst Damage, Fuel Level Low
P1395 (2)Cylinder 5 Misfire Detected; Potential Catalyst Damage, Fuel Level Low
P1396 (2)Cylinder 6 Misfire Detected; Potential Catalyst Damage, Fuel Level Low
P1413 (1)Secondary Air Injection Pump Relay Open/Short Circuit To Ground
P1414 (1)Secondary Air Injection Pump Relay Open/Short Circuit To Battery Voltage
P1441 (1)EVAP Purge Valve Circuit & Low Fuel Level Problems Reported At Same Time
P1442 (1)EVAP Purge Valve System Leak & Low Fuel Level Problems Reported At Same Time
P1444EVAP Canister Close Valve Circuit Open/Short To Ground
P1445EVAP Canister Close Valve Circuit Short To Battery Voltage
P1451EVAP Tank Pressure Sensor Malfunction
P1452EVAP Tank Pressure Sensor Value Too Low When Depressurized
P1453EVAP Tank Pressure Sensor Value Too High When Depressurized
P1455 (1)EVAP Purge Valve System Major Leak & Low Fuel Level Problems Reported At Same Time
P1460 (5)Immobilizer Active
P1491 (1)Tank Pressure Sensor Malfunction & Low Fuel Level Problems Reported At Same Time
P1492 (1)Tank Pressure Sensor Value Too Low & Low Fuel Level Problems Reported At Same Time
P1493 (1)Tank Pressure Sensor Value Too High & Low Fuel Level Problems Reported At Same Time
P1530Pedal Position Sensor Circuits No. 1 & 2 Voltage Sum Out Of Range
P1531Pedal Position Sensor Circuits No. 1 & 2 Adapted Voltage Sum Out Of Range
P1532Pedal Position Sensor Circuits No. 1 & 2 Control Module Circuits Shorted To Each Other
P1549 (3)Charge Air Malfunction
P1576Brake Light Switch Circuit Open/Short To Battery Voltage
P1577Brake Light Switch Circuit Short To Ground
P1601-P1633Internal Control Module Malfunction
P1624Transmission Control Module Request "CHECK ENGINE" Input
P1640Main Relay Circuit No Voltage To Control Module Pin No. 1
P1641Fuel Pump Relay No Voltage To Fuel Pump & HO2S Heater
P1652Main Relay Coil Circuit Open Or Short To Ground
P1653Main Relay Coil Circuit Short To Battery Voltage
P1654Fuel Pump Relay Coil Circuit Open Or Short To Ground
P1655Fuel Pump Relay Coil Circuit Short To Battery Voltage
P1656A/C Relay Coil Circuit Open Or Short To Ground
P1657A/C Relay Coil Circuit Short To Battery Voltage
P1658 (3)Charge Air Bypass Valve Circuit Open Or Short To Ground
P1659 (3)Charge Air Bypass Valve Circuit Short To Battery Voltage
P1662 (3)Charge Air Control Valve Circuit Open Or Short To Ground
P1662 (3)Charge Air Control Valve Circuit Short To Battery Voltage
P1670Throttle Limp-home Relay Coil Circuit Open Or Short To Ground
P1671Throttle Limp-home Relay Coil Circuit Short To Battery Voltage
P1676Injector Circuit Open Or Short To Ground Or Battery Voltage
P1908(6) No Serial Bus Data From MIU
P1923(7) No Serial Bus Data From TCM
P1925No Bus Communication With Torque Control/Anti-Lock Brake System (TC/ABS)
(1) Low Emissions Vehicles (LEV) only. (2) V6 engine only. (3) 4-cylinder engine only. (4) May set if throttle mechanism is not reset after repairs. (5) If new T7, MIU or TWICE module was installed, use scan tool to reprogram module in TWICE. (6) Main Instrument Unit. (7) Transmission Control Module.
(1)Low Emissions Vehicles (LEV) only.
(2)V6 engine only.
(3)4-cylinder engine only.
(4)May set if throttle mechanism is not reset after repairs.
(5)If new T7, MIU or TWICE module was installed, use scan tool to reprogram module in TWICE.
(6)Main Instrument Unit.
(7)Transmission Control Module.

DIAGNOSTIC TROUBLE CODES (DTC)

CLEARING DIAGNOSTIC TROUBLE CODES

Follow TECH 2 scan tool instructions to clear DTC(s).

DIAGNOSTIC TESTS

CAUTIONIf ECM replacement is instructed in following testing, always ensure ECM harness connector and ground circuits are okay. If either are suspect, repair and repeat testing to confirm ECM malfunction. Ensure DTCs are diagnosed in numerical order, starting with lowest number first.

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