Nissan Altima 2007-2012 Service Manual: Component diagnosis

On board diagnostic (OBD) System
Diagnosis Description INTRODUCTION The ECM has an on board diagnostic system, which detects malfunctions related to engine sensors or actuators. The ECM also records various emission-related d ...

Trouble diagnosis - specification value
Description The specification (SP) value indicates the tolerance of the value that is displayed in “SPEC” of “DATA MONITOR” mode of CONSULT-III during normal operation of the Engine Contr ...

Other materials:

P0420, P0430 Three way catalyst function
DTC Logic DTC DETECTION LOGIC The ECM monitors the switching frequency ratio of air fuel ratio (A/F) sensor 1 and heated oxygen sensor 2. A three way catalyst (manifold) with high oxygen storage capacity will indicate a low switching frequency of heated oxygen sensor 2. As oxygen storage c ...

Door speaker (coupe)
Description The audio unit sends audio signals to the BOSE speaker amp. The BOSE speaker amp. amplifies the audio signals before sending them to the door speakers using the audio signal circuits. Diagnosis Procedure 1.HARNESS CHECK 1. Disconnect BOSE speaker amp. connector B121 and suspec ...

B terminal circuit
Description The “B” terminal is constantly supplied with battery power. Diagnosis Procedure CAUTION: Perform diagnosis under the condition that the engine cannot start by the following procedure. 1. Remove fuel pump fuse. 2. Crank or start the engine (where possible) until the fuel p ...