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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 97 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P2195, DTC P2196, DTC P2197, DTC P2198, DTC P2237 & DTC P2240 >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different car, the 2003 Lexus RX 300. However, it is still accessible from the selected car via links, so may be relevant.

After confirming DTC P2195, P2197, P2198, P2237 or P2240, use the OBD-II scan tool or hand-held tester to confirm the voltage output of the A/F sensor (AFS 131 S1/02S B1 S1) from CURRENT DATA. The A/F sensor output voltage and the short-term fuel value can be read using the OBD-II scan tool or hand-held tester. The ECM controls the voltage of AFR/AFL(+) and AFR/AFL(-) terminals of ECM to the fixed voltage. Therefore, it is impossible to confirm the A/F sensor output voltage without the OBD-II scan tool or hand-held tester. OBD-II scan tool (excluding hand-held tester) displays one-fifth of the A/F sensor output voltage which is displayed on the hand-held tester.

NOTE: If DTC P2195, P2196 or P2237 is displayed, check bank 1 Sensor 1 circuit. If DTC P2197, P2198 or P2240 is displayed, check bank 2 sensor 1 circuit. Bank 1 refers to the bank that includes cylinder No.1. Bank 2 refers to the bank that includes cylinder No. 2. Sensor 1 refers to the sensor closest to the engine body. Read freeze frame data using hand-held tester or OBD-II scan tool, as freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful to determine whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich at the time of the malfunction.
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