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Home >> Suzuki >> 2001 >> XL-7 Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 29 (Engine Controls - Self-Diagnostics - 3.2L) >> Diagnostic Tests >> DTC P0420: Low Catalyst Efficiency Bank 1 Or DTC P0430: Low Catalyst Efficiency Bank 2 >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different car, the 2002 Isuzu Rodeo Sport, 2002 Isuzu Rodeo, 2002 Isuzu Axiom, and 2002 Honda Passport. However, it is still accessible from the selected car via links, so may be relevant.

Inspect harness connectors for backed-out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal-to-wire connection, and damaged harness. If harness appears to be okay, use scan tool to observe HO2S readings while moving connectors and harnesses. A change in display will indicate location of fault. If DTC cannot be duplicated, check scan tool FAILURE RECORDS to determine mileage since last DTC was set.

By using TECH 2 scan tool in TWC MONITOR TEST COUNTER mode TWC diagnostic test can be monitored. To complete TWC diagnostic test, counter must be allowed to count 49 samples and roll over to zero at least twice. A bad catalytic convertor will require 3 or more 50 sample tests to report failure.

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