Checking the signal cable

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.

Fig 1: Identifying Ignition ON

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Disconnecting Connector

Courtesy of VOLVO CARS OF NORTH AMERICA.

Ignition on
Disconnect the intake air temperature sensor connector.
Connect a voltmeter between the intake air temperature (IAT) sensor connector terminal #1 (control module side) and ground.

The voltmeter should read approximately 5 V.
1. more than 5 V
  Refer to Checking wiring and terminals
2. approximately 5 V
  Refer to Defective intake air temperature (IAT) sensor
3. 0 V.
  Refer to Checking wiring and terminals
Fig 3: Identifying Intake Air Temperature (IAT) Sensor Circuit
Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 4: Identifying Injector Terminals
Courtesy of VOLVO CARS OF NORTH AMERICA.