Test Mode No. 2 (Verifying Operation Of System Components)

This test mode is activated by briefly pressing test button on Volvo diagnostic unit 2 times, causing LED to rapidly flash. ECM will flash a code indicating receipt of a signal from following components with ignition on:

• 3-3-2 - TP sensor (throttle moved from or to idle).
• 3-3-3 - TP sensor (throttle moved from or to WOT).
• 1-2-4 - Transmission Control Module (TCM), when gear selector is moved from or to a drive position.

Control unit will flash a code indicating receipt of a signal from following components with engine running:

• 1-1-4 - A/C control, when A/C button is depressed or released.
• 1-3-4 - A/C compressor running.
• 1-4-1 - RPM sensor.
• 3-4-2 - Camshaft Position (CMP) sensor.
• 3-4-3 - Vehicle Speed Sensor (VSS).