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Attachment 2

2013 Amendments to HD OBD and OBD II Requirements That 

Relax Existing Requirements187

Amendments to HD OBD Requirements in Title 13, CCR section 1971.1

A. Section (c): Definitions.

1. “Alternate phase-in” /[1968.2(c)]

1. “Diagnostic or emission critical” 

2. “Warm-up cycle”

B. General Requirements

1. Section (d)(4.3.2)(E)/ [1968.2(d)(4.3.2)(F)]: Denominator Specifications

2. Section (d)(4.3.2)(F): Denominator Specifications

3. Section (d)(4.3.2)(J): Denominator Specifications for Hybrid Vehicles

4. Section (d)(7.6): 2013 Model Year Hybrid Vehicles

C. Monitoring Requirements for Diesel/Compression-Ignition Engines.

1. Section (e)(3.2.6)/ [1968.2(f)(6.2.6)]: Exhaust Gas Recirculation (EGR) 

System Monitoring - Malfunction Criteria for EGR Catalyst 

Performance

2. Section (e)(5.2.3)(B)/ [1968.2(f)(1.2.3)(B)]: NMHC Converting Catalyst 

Monitoring – Delay Implementation Start Date to 2015

3. NOx Converting Catalyst Monitoring

a. Sections (e)(6.2.1) and (e)(6.2.2)/ [1968.2(f)(2.2.2)(A)]: Conversion 

Efficiency and Reductant Delivery Performance Monitoring

b. Section (e)(6.3)/ [1968.2(f)(2.3.1]: Monitoring Conditions for 

Reductant Delivery Performance Monitoring

4. PM Filter Monitoring

a. Section (e)(8.2.1): Filtering Performance Monitoring – Increasing 

PM Threshold/ [1968.2(f)(9.2.1)]

b. Section (e)(8.2.4)/ [1968.2(f)(9.2.4)(A)]: NMHC Conversion 

Monitoring 

5. Exhaust Gas Sensor Monitoring

a. Section (e)(9.2.2)(A)/ [1968.2(f)(5.2.2)(A)]: NOx and PM sensors

Malfunction Criteria

b. Section (e)(9.3.1) NOx and PM sensors Monitoring Conditions

D. Monitoring Requirements for All Engines

1. Comprehensive Component Monitoring

a. Sections (g)(3.1.4) and (g)(3.1.5): Exceptions for Hybrid Vehicles

b. Section (g)(3.2.2)(B)(ii)d.: Diesel Idle Control System Monitoring

c. Section (g)(3.2.2)(F)/ [1968.2(f)(15.2.2)(F)(ii)]: Malfunction Criteria 

for Certain Output Components

d. Section (g)(5.7): Monitor Disablement at Low Temperatures

187 Amendments to provisions of the OBD II regulation are indicated by providing the 

corresponding provision in section 1968.2 in brackets [ ]. 
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e. Section (g)(5.8)/ [1968.2(f)(17.2.3)]: Alternate Phase-in Schedules

E. Standardization Requirements

1. Sections (h)(4.4.1)(F)(iv) and (4.4.2)(F)(iv): Erasing of Permanent Fault 

Codes 

2. Section (h)(4.8.3): Reprogrammable Vehicle Identification Number 

(VIN) and Engine Serial Numbers (ESN)

F. Monitoring System Demonstration Requirements for Certification - Section 

(i)(3.2.7): Exhaust Gas Sensors

G. Deficiencies

1. Section (k)(4): Carry-over Deficiencies

2. Section (k)(6.1): Retroactive Deficiencies

2. Section (k)(7): Deficiencies for PM Filter and PM Sensor Monitors

3. Section (k)(8): Deficiencies for Hybrid Vehicles

H. Production Engine/Vehicle Evaluation Testing

1. Section (l)(2.1): Verification of Monitoring Requirements

2. Section (l)(2.3.6): Exemption from Testing of Specific Diagnostics

Amendments to OBD II Requirements in Title 13, CCR section 1968.2

A. General Requirements

1. 1968.2(d)(3.2.1)(D)(vi): Monitoring Conditions – Diesel Performance 

Monitors and Missing Substrate Monitors

B. Monitoring Requirements for Diesel/Compression-Ignition Engines

1. 1968.2(f)(17.1): Exceptions to Monitoring Requirements
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