1GR-FE ENGINE CONTROL SYSTEM SFI SYSTEM

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1 84 1GR-FE EINE CONTROL SYSTEM SFI SYSTEM P0037 Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 2) P0038 Oxygen Sensor Heater Control Circuit High (Bank 1 Sensor 2) P0057 Oxygen Sensor Heater Control Circuit Low (Bank 2 Sensor 2) P0058 Oxygen Sensor Heater Control Circuit High (Bank 2 Sensor 2) P0141 Oxygen Sensor Heater Circuit Malfunction (Bank 1 Sensor 2) P0161 Oxygen Sensor Heater Circuit Malfunction (Bank 2 Sensor 2) Sensor 2 refers to the sensor mounted behind the Three-Way Catalytic Converter (TWC) and located furthest from the engine assembly. DCRIPTION Refer to P0136 (See page -128). When any of these s are set, the ECM enters fail-safe mode. The ECM turns off the Heated Oxygen (HO2) sensor heater in fail-safe mode. Fail-safe mode continues until the ignition switch is turned off. The ECM provides a pulse width modulated control circuit to adjust the current through the heater. The HO2 sensor heater circuit uses a relay on the B+ side of the circuit. Reference (System Diagram of Bank 1 Sensor 2): Engine Room Junction Block EFI Relay EFI No. 2 Fuse HO2 Sensor ECM From Battery Ground EFI No. 1 Fuse +B E1 Heater HT OX1B Sensor HT1B OX1B E2 Duty Control MREL G042820E04

2 1GR-FE EINE CONTROL SYSTEM SFI SYSTEM 85 No. Detection Conditions Trouble Areas P0037 P0057 P0038 P0058 P0141 P0161 Heated Oxygen (HO2) sensor heater current is less than 0.3 A (1 trip detection logic) Heated Oxygen (HO2) sensor heater current is more than 2 A (1 trip detection logic) Cumulative heater resistance correction value exceeds the acceptable threshold. (2 trip detection logic) Open in HO2 sensor heater circuit HO2 sensor heater EFI relay ECM Short in HO2 sensor heater circuit HO2 sensor heater EFI relay ECM Open or short in HO2 sensor heater circuit HO2 sensor heater EFI relay ECM Bank 1 refers to the bank that includes cylinder No. 1. Bank 2 refers to the bank that does not include cylinder No. 1. Sensor 1 refers to the sensor closest to the engine assembly. Sensor 2 refers to the sensor furthest away from the engine assembly. MONITOR DCRIPTION The sensing portion of the Heated Oxygen (HO2) sensor has a zirconia element which is used to detect the oxygen concentration in the exhaust gas. If the zirconia element is at the appropriate temperature, and the difference between the oxygen concentrations surrounding the inside and outside surfaces of the sensor is large, the zirconia element generates voltage signals. In order to increase the oxygen concentration detecting capacity of the zirconia element, the ECM supplements the heat from the exhaust with heat from a heating element inside the sensor. Heated oxygen sensor heater range check (P0037, P0038, P0057 and P0058): The ECM monitors the current applied to the O2 sensor heater to check the heater for malfunctions. If the current is below the threshold value, the ECM will determine that there is an open circuit in the heater. If the current is above the threshold value, the ECM will determine that there is a short circuit in the heater. Example: The ECM sets P0038 or P0058 when the current in the HO2 sensor heater is more than 2 A. Conversely, when the heater current is less than 0.3 A, P0037 or P0057 is set. Heated oxygen sensor heater performance (P0141 and P0161): After the accumulated heater ON time exceeds 100 seconds, the ECM calculates the heater resistance using the battery voltage and the current applied to the heater. If the resistance is above the threshold value, the ECM will determine that there is a malfunction in the HO2S heater and set P0141 and P0161. MONITOR STRATEGY Related s P0037: Heated oxygen sensor heater (bank 1 sensor 2) open/short (Low electrical P0038: Heated oxygen sensor heater (bank 1 sensor 2) open/short (High electrical P0057: Heated oxygen sensor heater (bank 2 sensor 2) open/short (Low electrical P0058: Heated oxygen sensor heater (bank 2 sensor 2) open/short (High electrical Required Sensors / Components (Main) Heated oxygen sensor heater (bank 1 sensor 2) Heated oxygen sensor heater (bank 2 sensor 2) Required sensors / components (Sub) - Frequency of Operation Duration Continuous: P0037, P0038, P0057, P0058 Once per driving cycle: P0141, P seconds: P0037, P0057 Within 1 second: P0038, P seconds: P0141 and P0161

3 86 1GR-FE EINE CONTROL SYSTEM SFI SYSTEM MIL Operation Sequence of Operation MIL operation Immediate: P0037, P0038, P0057 and P driving cycles: P0141 and P0161 None TYPICAL ENABLI CONDITIONS P0037 and P0057 (Low : 1. When all conditions below are met V or more to less than 20 V Learned heater current during heater OFF Duration of following conditions are met 0.5 seconds or more Heater OFF time Less than 0.1 seconds Heater current Less than 0.3 A 2. Heater OFF time 1 second or more 3. When all condition below are met - Learned heater OFF current operation Heater OFF time Less than 0.1 seconds P0038 and P0058 (High : When one of following conditions is met: Condition 1, 2 or 3 1. When all conditions below are met V or more Engine Running Starter OFF Catalyst monitoring active A/F control 2. When all conditions below are met: V or more to less than 20 V Learned heater current during heater OFF Heater OFF time Less than 0.1 seconds Heater current 2 A or more 3. Heater OFF time 1 second or more P0141 and P0161: When one of following conditions is met: Condition 1 or 2 1. All of the following conditions are met: V or more Fuel cut OFF Time after fuel cut ON to OFF 30 seconds or more Accumulated heater ON time 100 seconds or more Learned heater OFF current operation 2. Duration that rear heated oxygen sensor impedance is less than 15 kω 2 seconds or more

4 1GR-FE EINE CONTROL SYSTEM SFI SYSTEM 87 TYPICAL MALFUNCTION THRHOLDS P0037 and P0057 (Low : Heater current P0038 and P0058 (High : Less than 0.3 A When either condition below is met - Learned heater OFF current More than 2 A Heater current - Learned heater OFF current 2 A or more P0141 and P0161 (Heater performance monitor check): Accumulated heater resistance Varies with sensor element temperature (Example: More than 23 ohm) COMPONENT OPERATI RAE Heated Oxygen (HO2) sensor heater current 0.4 to 1.0 A (when engine idles, HO2 sensor warmed up and battery voltage 11 to 14 V) MONITOR RULT Refer to CHECKI MONITOR STATUS (See page -14). WIRI DIAGRAM Refer to P0136 (See page -135). INSPECTION PROCEDURE If other s relating to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit. Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air/fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

5 88 1GR-FE EINE CONTROL SYSTEM SFI SYSTEM 1 INSPECT HEATED OXYGEN SENSOR (HEATER RISTANCE) Component Side: HO2 Sensor H6 +B Bank 1 HT Disconnect the H6 or H8 Heated Oxygen (HO2) sensor connector. Measure the resistance between the terminals of the HO2 sensor connector. Standard resistance: Bank 1 HT (1) - +B (2) 11 to 16 Ω at 20 C (68 F) H8 Bank 2 E +B Front View HO2 Sensor OX HT (c) Bank 2 HT (1) - E (4) HT (1) - +B (2) 11 to 16 Ω at 20 C (68 F) HT (1) - E (4) Reconnect the HO2 sensor connector. REPLACE HEATED OXYGEN SENSOR E Front View OX A126268E03 2 INSPECT EFI RELAY Remove the EFI relay from the engine room R/B. Measure the EFI relay heater relay resistance. Standard resistance (when battery voltage applied to terminals 1 and 2 (c) Reinstall the EFI relay. B REPLACE EFI RELAY

6 1GR-FE EINE CONTROL SYSTEM SFI SYSTEM 89 3 INSPECT ECM (HT1B OR HT2B VOLTAGE) ECM: E4 E5 E6 Turn the ignition switch on. Measure the voltage between the terminals of the E4, E5 and E6 ECM connector. Standard voltage HT1B (E4-1) - E1 (E6-1) 9 to 14 V HT2B (E5-5) - E1 (E6-1) 9 to 14 V HT1B (+) HT2B (+) E1 (-) A131509E33 The HT1B means the heated oxygen sensor bank 1 sensor 2. The HT2B means the heated oxygen sensor bank 2 sensor 2. REPLACE ECM

7 90 1GR-FE EINE CONTROL SYSTEM SFI SYSTEM 4 CHECK HARNS AND CONNECTOR (HEATED OXYGEN SENSOR - ECM, HEATED OXYGEN SENSOR - EFI RELAY) Wire Harness Side: HO2 Sensor Connector H6 Bank 1 H8 Bank 2 HT +B Front View E4 E5 HT2B HT1B ECM Connector Engine Room R/B EFI Relay Check the harness and the connector between the ECM and the HO2 sensor. (1) Disconnect the H6 or H8 HO2 sensor connector. (2) Disconnect the E4 or E5 ECM connector. (3) Measure the resistance. Standard resistance (Check for open) HT (H6-1) - HT1B (E4-1) HT (H8-1) - HT2B (E5-5) Standard resistance (Check for short) HT (H6-1) or HT1B (E4-1) - Body ground HT (H8-1) or HT2B (E5-5) - Body ground Check the harness and the connector between the HO2 sensor and EFI relay. (1) Inspect the EFI No. 2 fuse Remove the EFI No. 2 fuse from engine room R/ B. Check the EFI No. 2 fuse resistance. Standard resistance: (2) Measure the resistance. Remove the engine room junction block. Standard resistance (Check for open): +B (H6-2) - EFI relay (3) +B (H8-2) - EFI relay (3) Standard resistance (Check for short): A138715E01 +B (H6-2) or EFI relay (3) - Body ground +B (H8-2) or EFI relay (3) - Body ground (3) Reconnect the HO2 sensor connector. (4) Reconnect the ECM connector. (5) Reinstall the EFI relay. REPAIR OR REPLACE HARNS OR CONNECTOR REPLACE ECM

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