LEMON Manuals: Even more car manuals for everyone
Home >> Volvo >> 2008 >> S40 T-5, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 43 (Electronic Control Module (ECM) Diagnostic Trouble Codes - 3 Of 3 (644 Body)) >> ECM-8A: Idle Air Control (IAC) Valve. Signal Too High. Intermittent Fault (B4204T2 CVVT; 2000) >> Signal too high. Intermittent fault >> Checking components and wiring

Checking components and wiring

WARNING: This page is about a different car, the 2004 Volvo S40, 2003 Volvo S40, 2002 Volvo S40, 2001 Volvo S40, and 2000 Volvo S40. However, it is still accessible from the selected car via links, so may be relevant.

Check that the resistance between idle air control (IAC) valve terminals 1 and 2 is approximately 10 Ω at +20 °C.

Check the signal cable between engine control module (ECM) terminal 64 and idle air control (IAC) valve terminal 2 for an intermittent short-circuit to supply voltage. Remedy according to Short-circuit to supply voltage, intermittent faults .

Other information 

Fig 1: Identifying Idle Air Control (IAC) Valve Connector Terminals
GLL112412Courtesy of VOLVO CARS OF NORTH AMERICA.
Fig 2: Identifying Ohmmeter
GLL101042Courtesy of VOLVO CARS OF NORTH AMERICA.
Fig 3: Identifying EMS2000
GLL111998Courtesy of VOLVO CARS OF NORTH AMERICA.