Chart 8

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Lack/Loss of Power

NOTE: Verify the symptom is reported under normal driving conditions without excessive engine or vehicle load. Also, be aware of the engine RPM/speed limiting functions of the PCM.

NOTE: For vehicles equipped with a knock sensor, a lack of power may result when the vehicle is operated with a breakout box installed at the PCM. The knock sensor circuits are not shielded in the breakout box, and knock sensor signal noise may be noticed by the PCM. If this happens, spark timing is retarded and a lack of power may result.

NOTE: For applications with a knock sensor, a lack of power may result if the engine has developed an abnormal noise. The knock sensors may interpret some abnormal noise as detonation and retard spark timing.

SYSTEM/COMPONENT	REFERENCE (Section 5 Pinpoint Test unless noted)
Automatic Transmission Fluid	Visual
Throttle Linkage	Visual
Air Cleaner Element	Visual
Check the following PIDS: LONGFT1/LONGFT2 (value between -20 and +20%) IMTVF (if equipped): For both key ON, engine OFF and key ON, engine running with the transmission in PARK/NEUTRAL and the engine RPM greater than 3,000 RPM, the PID should indicate no fault (or NO) in both situations.	LONGFT1/LONGFT2 value low (-): Continue diagnosis. Concentrate checks in areas that would cause the engine to run rich. LONGFT1/LONGFT2 value high (+): Continue diagnosis. Concentrate checks in areas that would cause the engine to run lean. IMTVF PID indicates a fault: refer to PINPOINT TEST HU - Intake Air Systems .
Fuel Delivery System	refer to PINPOINT TEST HC - Fuel Delivery System .
Secondary Ignition	For vehicles equipped with a coil pack ignition system, refer to PINPOINT TEST JC - Secondary Ignition (Coil Pack) . For all others, refer to PINPOINT TEST JB - Secondary Ignition (COP) .
MAF Sensor	refer to PINPOINT TEST DC - Mass Air Flow (MAF) Sensor .
Exhaust System	refer to PINPOINT TEST HF - Catalyst Efficiency Monitor and Exhaust Systems .
Variable Camshaft Timing (VCT) System	refer to PINPOINT TEST HK - Variable Camshaft Timing (VCT) .
Accelerator Pedal Position Sensor	refer to PINPOINT TEST DK - Accelerator Pedal Position Sensor .
Base Engine	REFER to the Workshop Manual Section 303-00, Engine System and carry out the Inspection and Verification to continue diagnosis.
Automatic Transmission	REFER to the Workshop Manual Section 307-01, Automatic Transmission/Transaxle diagnostic strategy to continue diagnosis.
Brake System Drag or Binding	REFER to the Workshop Manual Section 206-00, Brake System.
Supercharger Bypass System	refer to PINPOINT TEST KJ - Supercharger Bypass Control .
Additional Testing	refer to PINPOINT TEST Z - Intermittent .
Additional Checks: Some vehicles have a TQ_CNTRL PID available. Check this PID to determine if the PCM is reducing torque, and if so, why the torque is being reduced. As a PID display example; 0 equals no torque reduction requested, 1 equals torque truncation, which cuts fuel to protect when line pressure falls to minimum limit, and 2 equals traction control event, which cuts fuel/spark for traction control. Customer driving habits Correct PCM vehicle identification (VID) block information. Refer to Section 2, FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) to carry out the Making Changes to the VID Block procedure. Intake manifold runner control (IMRC) linkage (if equipped) Clutch (M/T) Charging system Engine RPM/speed limiting functions of the PCM (look for incorrect high vehicle speed signal from ABS, VSS, or OSS)	Visual. REFER to the applicable Workshop Manual section.