looses power. instrument panel displays "reduced power". 25mph full throttle. engine missing, rough idle. Intermittent
Jun 1, 2009 at 6:13 AM
2000 Volvo S80
2000 VOLVO S80
GEOFFANDBILL
- MEMBER
- 1 POST
- FOLLOW
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1st step should be getting codes
SELF-DIAGNOSTIC SYSTEMS
ON-BOARD DIAGNOSTICS
This system has complete self-diagnostic capabilities. This systems uses a single ECM that receives input from engine monitoring sensors. ECM uses these input signals to control air/fuel mixture for emission control, fuel economy and good driveability.
Signals from various sensors are monitored continuously. If certain signals are lost or become faulty, ECM will adopt fixed substitute values (limp-home mode) to enable vehicle to be driven for certain failures. Substitute values can be adopted for Engine Coolant Temperature sensor signal, Throttle Position sensor signal, Mass Airflow sensor signal, and oxygen sensor signal.
NOTE:To avoid confusion if there is an intermittent malfunction with Malfunction Indicator Light (MIL), carefully read following text.
Faults are recorded in ECM memory in the form of Diagnostic Trouble Codes (DTCs). Codes can be displayed using a generic scan tester connected to On-Board Diagnostics II (OBD-II) Data Link Connector (DLC).
ECM stores Diagnostic Trouble Codes (DTCs) differently in accordance with a predetermined pattern. An emission related fault must be present for a predetermined number of intervals before ECM permanently stores a DTC and illuminates MIL. If fault is cleared before a specified interval has passed, DTC is erased from memory.
SELF-DIAGNOSTIC SYSTEMS
ON-BOARD DIAGNOSTICS
This system has complete self-diagnostic capabilities. This systems uses a single ECM that receives input from engine monitoring sensors. ECM uses these input signals to control air/fuel mixture for emission control, fuel economy and good driveability.
Signals from various sensors are monitored continuously. If certain signals are lost or become faulty, ECM will adopt fixed substitute values (limp-home mode) to enable vehicle to be driven for certain failures. Substitute values can be adopted for Engine Coolant Temperature sensor signal, Throttle Position sensor signal, Mass Airflow sensor signal, and oxygen sensor signal.
NOTE:To avoid confusion if there is an intermittent malfunction with Malfunction Indicator Light (MIL), carefully read following text.
Faults are recorded in ECM memory in the form of Diagnostic Trouble Codes (DTCs). Codes can be displayed using a generic scan tester connected to On-Board Diagnostics II (OBD-II) Data Link Connector (DLC).
ECM stores Diagnostic Trouble Codes (DTCs) differently in accordance with a predetermined pattern. An emission related fault must be present for a predetermined number of intervals before ECM permanently stores a DTC and illuminates MIL. If fault is cleared before a specified interval has passed, DTC is erased from memory.
Jun 1, 2009 at 6:31 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.